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Question

A ball of mass m is thrown straight upward from the top of a multi-storey building with an initial velocity of +15 m/s.
Find out the approximate maximum height reached by the ball?

A
23m
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B
15m
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C
11m
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D
8m
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E
5m
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Solution

The correct option is C 11m
Given : u=15 m/s a=g=10m/s2 (taking upward direction to be positive)
Final velocity of the ball at the highest point v=0 m/s
Using v2u2=2aS
0(15)2=2×(10)S S=11.2511 m

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