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A body is released from a great height, falls freely towards the earth. Another body is released from the same height exactly a second later. Then, the separation between two bodies, 2 s after the release of the second body is nearly

1) 15 m 2) 20 m 3) 25 m 4) 30 m Answer: 3) 25 m Solution: For the first body S = 0 + (1/2) x g x (3)2 = (9/2)g For the second body... View Article

From the top of tower a body A is projected vertically up, another body B is horizontally thrown and a third body C is thrown vertically down with same velocity. Then,

1) B strikes the ground with more velocity 2) C strikes the ground with less velocity 3) A, B and C strike the ground with same velocity 4) A... View Article

When a bullet is fired at a target, its velocity decreases by half after penetrating 30 cm into it. The additional thickness it will penetrate before coming to rest is

1) 30 cm 2) 40 cm 3) 10 cm 4) 50 cm Answer: 3) 10 cm Solution: Let the velocity of the bullet when it strikes the target is v... View Article

A body is moving with uniform acceleration covers 200 m in the first 2 s and 220 m in the next 4 s. Find the velocity in ms^-1 after 7 s.

1) 10 2) 15 3) 20 4) 30 Answer: 1) 10 Solution: u is the initial velocity a is the acceleration In first case s1=ut1+12at12 t1 = 2s... View Article

A bullet comes out of the barrel of gun of length 2 m with a speed 80 ms^-1. The average acceleration of the bullet is

1) 1.6 ms-2 2) 160 ms-2 3) 1600 ms-2 4) 16 ms-2 Answer: 3) 1600 ms-2 Solution: V2=u2+2as 802 = 0 + 2 x a x2 a = 802 /4... View Article

A particle moves along a straight line OX. At a time t (in second) the distance x (in metre) of the particle from O is given by x = 40 + 12t – t³. How long would the particle travel before coming to rest?

1) 24 m 2) 40 m 3) 56 m 4) 16 m Answer: 3) 56 m Solution: Given, the distance travelled by the particel x=0+12t−t3 The rate of... View Article

A body dropped from top of a tower fall through 60 m during the last 2s of its fall

A body dropped from top of a tower fall through 60 m during the last 2s of its fall. The height of tower is (take,g = 10 ms-2) 1) 95 m 2) 60 m... View Article

A balloon going upward with a velocity of 12 ms^-1

A balloon going upward with a velocity of 12 ms-1 is at a height of 65 m from the earth's surface at any instant. Exactly at this instant, a ball... View Article

From a balloon rising vertically upwards 5 ms^-1 at stone is thrown up at 10 ms^-1 relative to the balloon. Its velocity w.r.t. ground after 2 s is (assume, g = 10 ms^-2)

1) zero 2) -5 ms-1 3) 10 ms-1 4) 20 ms-1 Answer: 2) -5 ms-1 Solution: From the equation of motion, we get v=u+gt u=10+5=15m/s... View Article

From the top of a tower, two stones, whose masses are in the ratio

From the top of a tower, two stones, whose masses are in the ratio 1 : 2 are thrown on straight up with an initial speed u and the second... View Article

A balloon is rising vertically up with a velocity of 29 ms^-1. A stone is dropped from it and it reaches the ground in 10 s. The height of the balloon when the stone was dropped from it is ( take,g = 9.8 ms^-2 )

1) 400 m 2) 150 m 3) 100 m 4) 200 m Answer: 4) 200 m Solution: s = ut + (1/2) at2 = - ut + (1/2) at2 h =... View Article

A bullet moving with a speed of 100 ms^-1 can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be

1) 6 2) 10 3) 4 4) 8 Answer:4) 8 Solution: v2= u2 + 2as When acceleration is negative v2= u2 - 2as final velocity, v = 0 u2 = 2as... View Article

A bullet fired into a fixed wooden block loses half of its velocity after penetrating 40 cm. It comes to rest after penetrating a further distance of

1) 22/3 2) 40/3 3) 20/3 4) 22/5 5) 26/5 Answer: 2) 40/3 Solution: (from A to B) v2 = u2 - 2as ⇒ (v/2)2 = v2 - 2a x... View Article

Archives

A body is released from a great height, falls freely towards the earth. Another body is released from the same height exactly a second later. Then, the separation between two bodies, 2 s after the release of the second body is nearly

From the top of tower a body A is projected vertically up, another body B is horizontally thrown and a third body C is thrown vertically down with same velocity. Then,

When a bullet is fired at a target, its velocity decreases by half after penetrating 30 cm into it. The additional thickness it will penetrate before coming to rest is

A body is moving with uniform acceleration covers 200 m in the first 2 s and 220 m in the next 4 s. Find the velocity in ms^-1 after 7 s.

A bullet comes out of the barrel of gun of length 2 m with a speed 80 ms^-1. The average acceleration of the bullet is

A particle moves along a straight line OX. At a time t (in second) the distance x (in metre) of the particle from O is given by x = 40 + 12t – t³. How long would the particle travel before coming to rest?

A body dropped from top of a tower fall through 60 m during the last 2s of its fall

A balloon going upward with a velocity of 12 ms^-1

From a balloon rising vertically upwards 5 ms^-1 at stone is thrown up at 10 ms^-1 relative to the balloon. Its velocity w.r.t. ground after 2 s is (assume, g = 10 ms^-2)

From the top of a tower, two stones, whose masses are in the ratio

A balloon is rising vertically up with a velocity of 29 ms^-1. A stone is dropped from it and it reaches the ground in 10 s. The height of the balloon when the stone was dropped from it is ( take,g = 9.8 ms^-2 )

A bullet moving with a speed of 100 ms^-1 can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be

A point initially at rest moves along X-axis.

A body is moving along a straight line path with constant velocity.

A particle moves along X-axis

The distance travelled s by an accelerated particle of mass M is given by the following relation

A body moves in a plane so that the displacement along the X and Y–axes is x = 3t² and y = 4t², then velocity is

A ball is dropped from the roof of a tower of height h.

A ball is dropped from a bridge at a height of 176.4 m over a river.

A bullet fired into a fixed wooden block loses half of its velocity after penetrating 40 cm. It comes to rest after penetrating a further distance of

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