a particle is dropped from the top of tower it travels 40m in last 2 sec. find height of tower
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v=0
t=2s
s=40m
g=10m/s2
u=??
h=??
s=d/t
= 40/2=20m/s
s=ut+1/2at2
=20×2+1/2×10×4
=40+20
= 60m
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