A stone is dropped from the top of a building How long does it take to fall 19.6 m

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A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity just before touching the ground. Physics Q&A

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A stone dropped from the top of a building, takes 4 seconds to reach the ground. Find the height of the building.

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a) s=ut+(1/2)gt^2 s = 0+(1/2)gt^2 s = (1/2)gt^2 t^2= 2h/g t^2=2×19.6/9.8 t^2=2×2 t^2=4

t= 2s Ans) 2 seconds

b) v^2=u^2+2gh v^2=0+2gh v^2=2gh v^2=2×9.8×19.6 v^2=19.6×19.6

v=19.6 m/s Ans) 19.6m/s

c) s=1/2at^2 a= 2s/t^2 a=2×19.