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Q.

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

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a

vB > vA

b

vA = vB

c

vA > vB

d

their velocities depend on their masses

answer is B.

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Detailed Solution

Taking all downward physical quantities positive and all upward physical quantities negative and using the equation  v→.v→=u→.u→+2g→.h→ , we get in both cases v2=u2 +2gh .
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