A 2 kg body at 6 m/s hits a 4 kg body at rest and they stick. Speed after?
A6 m/s
B3 m/s
C1 m/s
D2 m/s
Answer & Solution
Correct answer: D. 2 m/s
Momentum is conserved: 2 x 6 = (2 + 4) x v, so v = 2 m/s.
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