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Q.

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?

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a

h9 meters from the ground

b

7h9 meters from the ground

c

8h9 meters from the ground

d

17h18 meters from the ground

answer is C.

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Detailed Solution

∴ h = ut + 12gt2 ⇒ h = 12gT2After 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.

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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?