Q.

A ball of mass m moving with velocity V, makes a head on elastic collision with a ball of the same mass moving with velocity 2V towards it. Taking direction of V as positive velocities of the two balls after collision are

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a

-V and 2V

b

2V and -V

c

V and -2V

d

-2V and V

answer is D.

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Detailed Solution

Due to elastic collision of bodies having equal mass, their velocities get interchanged.
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A ball of mass m moving with velocity V, makes a head on elastic collision with a ball of the same mass moving with velocity 2V towards it. Taking direction of V as positive velocities of the two balls after collision are