APFIVE Kinetic Energy in a Perfectly Inelastic Collision
Two objects of masses m and 3m undergo a perfectly inelastic collision. If the object of mass m was initially moving at velocity v and the object of mass 3m was initially at rest, what fraction of the initial kinetic energy is retained after the collision?
A
1/4
B
3/4
C
1/3
D
1/2
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