Question

How long will a stone take to fall to th ground from the top of a building 80 m High and what will be the velocity of the stone on reaching the ground? (take g=10 m/s)

Answer 1

vsquare=u square +2as
v2=0^2+2×10×80
=0+1600
v2=1600
v=40
s=u+1/2at
80=0+1/2×10×t
80=5t
80/5=t
t=16
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Answer 2

hope it helps you dear ....