First slide
Collisions
Question

A body of mass m moving with velocity v makes a head-on collision with another body of mass 2 m which is initially at rest. The loss of kinetic energy of the colliding body (mass m) is

Moderate
Solution

ΔKK=1m1m2m1+m22=1m2mm+2m2=89

ΔK=89K i.e. loss of kinetic energy of the colliding body is 89 of its initial kinetic energy.

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