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A metal ball of mass 2 kg moving with a velocity of `36km//h` has a head on collision with a stationery ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy dur to collision is

A

40 J

B

60 J

C

100 J

D

140 J

Text Solution

Verified by Experts

The correct Answer is:
B
v= 36km/h= 10m/s
By law of conservation of momentum
`2 xx 10= (2 +3)V rArr V= 4m//s`
Loss K.E. `=(1)/(2) xx 2 xx (10)^(2) -(1)/(2) xx 5 xx(4)^(2)= 60J`
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