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Q.

A metal ball of mass 2 kg moving with speed of 36 km/h has a head-on collision with a stationary ball of mass 3 kg. If after collision, both the balls move together, then the loss in kinetic energy due to collision is

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a

40 j

b

60 j

c

100 j

d

140 j

answer is B.

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Detailed Solution

It is a perfectly inelastic collision and loss in K.E. 12m1m2m1+m2U1−U22=60J  Here U1=36×518=10m/s m1=2kg,m2=3kg U2=0
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