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A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m s-2, with what velocity will it strike the ground? After what time will it strike the ground?
Distance covered by the ball, S = 20 m
Acceleration, a = 10 ms-2
Initial velocity, u = 0 (since the ball was initially at rest)
Let final velocity of the ball with which it strikes the ground is v.
According to the third equation of motion:
According to the first equation of motion:
Time, t is taken by the ball to strike the ground is,
Hence the ball strikes the ground after 2 s with a velocity of 20 m/s.
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