Q.

A shell of mass 20 kg at rest explodes into two fragments whose masses are in the ratio 2 : 3. The smaller fragment moves with a velocity of 6 ms-1. The kinetic energy of the larger fragment is:

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a

216 J

b

96 J

c

144 J

d

360 J

answer is A.

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Detailed Solution

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Mass of smaller fragment =25×20=8kg
So mass of bigger part =12kg
K.E of bigger part
=P22m=(8×6)22(12)=96J

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