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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 in T3 seconds


A
h/9 meters from the ground      
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B
7h/9 meters from the ground
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C
8h/9 meters from the ground   
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D
17h/18 meters from the ground
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Solution

The correct option is C 8h/9 meters from the ground   

h=ut+12gt2 h=12gT2
                                
After T3 seconds , the position of ball,
h'=0+12g(T3)2=12×g9×T2
h'=12×g9×T2=h9m from top

  Position of ball from ground =h-h9=8h9m.


Physics

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