A ball is thrown upward with a speed of 3 m s-1 from the tower of 50 m high. Find the speed with which it strikes the ground (Ans. 31.76 ms]
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Because earth has a gravitional force
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Let the downward direction be positive .
Initial velocity is - 3 m/s
Displacement s = 50m
Acceleration a = 9.8 m / s ^2
Final speed = v
V^ 2 = u^2 + 2as
v^ 2 = (-3) ^2 + 2 *9,8 *50
v = 10.34 m/s .
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