AIPMT PRELIMS2005Physics-Mechanics
AIPMT PRELIMS 2005 Physics Conservation of Momentum MCQ Question
Type: MCQ-numerical-Medium-Class 11
A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 m/s. The kinetic energy of the other mass is:
A
243 J
B
486 J
C
564 J
D
388 J
Correct Answer
Option B
Detailed Explanation
Using conservation of momentum, the velocity of the 12 kg mass is (18 kg * 6 m/s) / 12 kg = 9 m/s. The kinetic energy is (1/2) * 12 kg * (9 m/s)² = 486 J.
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