Q.

A ball is dropped from a height. If it taken 0.200 s to cross the last 6.00 m before hitting the ground, find the height from which it was dropped. Take g=10 m/s2?

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answer is 48.

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Detailed Solution

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if height of the tower is h and total time taken is t 

h=12gt21

h-6=12gt-0.222

Solving 1 and 2 we get t=3.1

substituting the value of t in equation1 

h=48.01 m

 

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A ball is dropped from a height. If it taken 0.200 s to cross the last 6.00 m before hitting the ground, find the height from which it was dropped. Take g=10 m/s2?