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Question

# A particle of mass m1 and moving with velocity v1 collides head on with another stationary particle of mass m2elastically. If after the collision their velocities are v1 and v2 then under the condition m1=m2 their values will be :

A
v1=0,v2=0
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B
v1=u1,v2=u2
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C
v1=0,v2=u1
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D
v2=0,v1=u1
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Solution

## The correct option is C v1=0,v2=u1In elastic head-on collision for masses (m1=m2) with one of the mass at rest the velocities before collision get interchanged after collision. Hence, here after collision, v1=0 and v2=u1.

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