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Q.

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

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a

12 of its initial kinetic energy

b

19 of its initial kinetic energy

c

89 of its initial kinetic energy

d

14 of its initial kinetic energy

answer is C.

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Detailed Solution

ΔKK=1−m1−m2m1+m22=1−m−2mm+2m2=89ΔK=89K i.e. loss of kinetic energy of the colliding body is 89 of its initial kinetic energy.
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