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Question

A body ''A' is dropped from a height h and another body 'B' is thrown horizontally with a velocity of 10 ms1 from the same height simultaneously. If the time taken by the body A to reach the ground is 3 s, the time taken by the body B to reach the ground is ____ s.

A
3
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B
25
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C
75
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D
5
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Solution

The correct option is A 3
Initial Vertical velocity of A uA=0, Initial vertical velocity of B uB=0
Let time t to reach the ground by body B.
Using s=ut+12at2,
For body A, h=0×312×10×32 h=45m
For body B, h=0×t12×10×t2 t=3s.

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