Basic Maths and Units and DimensionsHard
Question
From a building two balls A and B are thrown such that A is thrown upwards A and B downwards (both vertically). If vA and vB are their respective velocities on reaching the ground, then
Options
A.vB > vA
B.vB = vA
C.vA > vB
D.their velocities depend on their masses
Solution
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,
mAVA2 = mAghA or vA = 
; Similarly, vB = 
or vA = vB
Hence,
mAVA2 = mAghA or vA = ; Similarly, vB = or vA = vBCreate a free account to view solution
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