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Question

From a building two balls A and B are thrown such that A is thrown upwards and B downwards (both vertically). If vA and vB are their respective velocities on reaching the ground, then

A
vA>vB
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B
vA=vB
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C
vA<vB
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D
Their velocities depend on their masses.
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Solution

The correct option is B vA=vB
As the ball moves down from height 'h' to ground the P.E. at height 'h' is converted to K.E. at the ground (Applying Law of conservation of Energy).
Hence, 12mAv2A=mAghA or vA=2gh;
Similarly, vB=2gh or vA=vB

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