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Question

A ball is released from the top of a tower of height h meters. It takes T seconds to reach the ground. What is the position of the ball at T3 second?

A
8h9 meters from the ground
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B
7h9 meters from the ground
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C
h9 meters from the ground
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D
17h18 meters from the ground
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Solution

The correct option is A 8h9 meters from the ground
We know that s=ut+12gt2,
or h=12gT2(u=0)
now for T3 second, vertical distance moved is given by
h=12g(T3)2h=12×gT29=h9
position of ball from ground =hh9=8h9

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