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Question

Rahul is standing on the street and wants to throw an 8kg book up to his friend who is leaning out of a window 5m above street level. With what velocity Rahul must throw the book so that it reaches his friend in the window?

A
5m/s
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B
8m/s
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C
10m/s
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D
40m/s
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E
50m/s
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Solution

The correct option is B 10m/s
Given : S=5 m v=0 m/s a=g=10m/s2
Let the initial velocity of the book be u.
Using v2u2=2aS
0u2=2(10)×5
u=10 m/s

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