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Q.

Two balls A and B are thrown simultaneously from the top of a tower. A is thrown vertically up with a speed of 4ms-1. B is thrown vertically down with a speed of  4ms-1. The ball A and B hit the ground with speed vAand vB  respectively. Then, 

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a

vA<vB

b

vA>vB

c

vAvB

d

vA=vB

answer is D.

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Detailed Solution

When A returns to the level of top of tower, its downward velocity is 4ms-1. This velocity is the same as that of B. So, both A and B hit the ground with the same velocity.

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