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1st Equation of Motion

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From the top of 490 m cliff a boy throws a stone horizontally with an intial speed of 15ms-1.what is time taken by the object to reach the ground??

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Q. A hiker stands on the edge of a cliff 490 , above the ground and throws a stone horizontally with an initial speed of

15 m s^{_{1}}

. Neglecting air resistance, find the time taken by the stone to reach the ground, and the speed with which it hits the ground.

(T a k e g = 9.8 m s^{- 2})

Q. From the top of a building of height

40 m

, a boy throws a stone vertically upwards with an initial velocity of

10 m s^{- 1}

such that it eventually falls to the ground. At what time will the stone reach the ground?

(g = 10 m s^{- 2})

Q. A projectile is fired horizontally with a speed of

98 m s^{- 1}

from the top of a hill

490 m

high. Find the time taken to reach the ground.

Q. Two balls are projected horizontally from the top of a building simultaneously with velocities

15 m s^{- 1}

20 m s^{- 1}

respectively, then the ratio of times taken by them to reach the ground is :

Q. A boy on a 784 m high cliff drops a stone. One second later, he throws another stone downwards with some speed. The two stones reach the ground simultaneously. Find the speed with which the second stone was thrown.

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