Momentum and CollisionMedium

Question

A ball of mass ′m′, moving with uniform speed, collides elastically with another stationary ball. The incident ball will lose maximum kinetic energy when the mass of the stationary ball is

Options

A.m
B.2m
C.4m
D.infinity 

Solution

If mass = m
first ball will stop ⇒ v = 0
so  k.e. = 0 (min)
In other cases then will be same
k.e. (k.e. can′t be negative)

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