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Q.

A mass of 12 Kg at rest explodes into two pieces of masses 4 Kg and 8 Kg which move in opposite directions.  If the velocity of 8 Kg peice is 4 ms−1 , then the kinetic energy of the other piece in joules is

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a

64

b

128

c

144

d

288

answer is B.

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Detailed Solution

KE2=12m2v22 =12×8×16  = 64JKE  α  1mKE1KE2=m2m1KE164=84KE1=128J
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