Velocity

Q. 7. The position-time graphs of two cars A and B are straight lines making angles 30^° and 60^° with the time axis respectively. The ratio of velocities of A and B is aait, of o prticle moving along a straight line is as shown in the fiqure aiven below. The

Q.

A 150 m long train is moving with a uniform velocity of 45 km/h. The time taken by the train to cross a bridge of length 850 meters is

1. 56 sec

2. 68 sec

3. 80 sec

4. 92 sec

Q.

The ratio of magnitude of velocity and speed is always:

1. Equal to or less than one

2. Less than one

3. Equal to or greater than one

4. One

Q. 34.The position time graph for a body moving along a straight line between o and a is shown . during its motion between o and a how many times body come to rest?

Q. 43. A ball A is thrown vertically upward with speed u. At the same time another ball B is released from a height h vertically above the point of projection of A. At any time instant, what is the magnitude of relative velocity of A wrt B?

Q. a man rows across a river with velocity 8km/h.if his resul†an t velocity is 10km/h then what is the speed of river water?

Q. 36.The position time graph of an object in uniform motion is given below. Calculate the velocity with which object is moving

Q. at what angle with the vertical should a ball be thrown so the range R is related to time of flight T as R=5T^2 (1)45 (2) 90 (3) 60 (4) 30

Q. { 2. A projectile is thrown with a velocity of }10ms^{-1} at an angle of }}{60^° with horizontal. The interval between the moments when }}{ speed is }\sqrt{5g}m/s is (Take, }g=10ms^{-2})

Q. 7. A ball is thrown vertically upwards. The velocity at one third of the maximum heigh is 8 m/s . The velocity with which of the ball was thrown up

Q.

A bus traveling along a straight highway covers one-third of the total distance between two places with a velocity $20km{h}^{-1}$. The remaining part of the distance was covered with a velocity of $30km{h}^{-1}$ for the first half of the remaining time and with velocity $50km{h}^{-1}$ for the next half of the time. Find the average velocity of the bus for its whole journey.

Q.

A train of length $200m$traveling at $30m{s}^{-1}$ overtakes another train of length $300m$ traveling at $20m{s}^{-1}$ Then the time taken by the first train to pass the second is

1. 10s

2. 30s

3. 40s

4. 50s

Q.

Distance time graph of a body is straight line making an angle of 30 degree with distance axis. What is its speed?

Q.

A vehicle is moving on a rough horizontal road with velocity v. The stopping distance will be directly proportional to

1. 

2. 

3. 

4. 

Q. 9. a ball is thrown vertically upwards with a velocity of 25m/s. If g=10m/s then calculate 1-height it reaches 2-time taken to return back

Q. if the displacement of an object during its motion is 100 m in a time interval of 20 seconds, then calculate the average velocity of the object with which it was moving through out his journey

Q. At what speed the velocity head of a stream of water be equal to 40 cm of Hg? a. 282.8 cm/s b. 432.6cm/s c. 632.6cm/s d. 832.6cm/s

Q. 3.The x-t graph of an object is given below calculate the velocity of the object

Q. 16.A spherical ball is dropped in a long column of viscous liquid . The graph for variation of speed of the ball as function of time is ??

Q. A plastic ball is taken to the bottom of a pond and released.It rises up and jumps off the water surface.Draw the position -time graph for its motion and justify the graph.Assume all accelerations as constant .

Q. by cross product, direction of torque is perpendicular to the plane containing F and R but in rotation we consider it either clokwise or anticlockwise

Q. The position of the particle is given by $x=2t^2+6t+2$ in $\text{m}$. The instantaneous speed of the particle at $6\text{sec}$ is

1. $20\text{m/s}$
2. $30\text{m/s}$
3. $24\text{m/s}$
4. $36\text{m/s}$

Q. 109.A ball is thrown upward draw a plot represent speed time graph of the ball during its flight if air resistance is not ignored Also explain how to draw this graph

Q. draw a graph between maximum safe speed(v without friction and \sqrt{†anθ

Q.

a ball is dropped from a building 45 m high simultaneously another ball is thrown up with a speed of 40m/s. calculate the relative speed of the balls with respect to time?

Q. the velocity of a moving particle is given by v=\sqrt{4x} if at t=0 particle is at x=0, then velocity and acceleration at t=2

Q. A particle is thrown with the speed u at an angle alpha with the horizontal. When the particle makes an angel beta with horizontal, its speed will be

Q.

A 150 m long train is moving with a uniform velocity of 45 km/h. The time taken by the train to cross a bridge of length 850 meters is

1. 56 sec

2. 68 sec

3. 80 sec

4. 92 sec

Q. The position time graph of two cars a and b are straight line making angle 30^° and 60^° with the time axus the ratio of velocity isof a and b1.1:\surd3 2.1:3 3.\surd3:14.3:1

Q. 3. Ram moves in east direction at a speed of 6 m/sand Shyam moves 30^° east of north at a speeof 6 m/s. The magnitude of their relative velocity is