EasyPhysicsconservation of momentum
+4 / -1
A bomb of mass 16 kg at rest explodes into two pieces of masses 4 kg and 12 kg. The velocity of the 12 kg mass is 4 m/s. The kinetic energy of the other mass is:
A
288 J
B
96 J
C
192 J
D
144 J
Explanation
By conservation of momentum, 4v + 12×4 = 0 ⇒ v = −12 m/s. Kinetic energy of 4 kg piece = (1/2)×4×(12)² = 288 J
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