Discussion Forum : Motion In One Dimension
Question -


A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about                       


 

Options:
A .   80 m
B .   40 m
C .   20 m
D .   160 m
Answer: Option A
:
A

We have,


h=12gt2=12×10×(4)2=80m



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