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2 kg at 6 m/s sticks to 4 kg at rest. Kinetic energy lost?
A24 J
B6 J
C36 J
D12 J
Answer & Solution
Correct answer: A. 24 J
Initial KE is 36 J and final is 0.5 x 6 x 4 = 12 J, so 24 J is lost.
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