Nellie Newton, of mass 30 kg, at rest on friction-free roller blades pushes away 25-kg Jake, also on roller blades, at 1 m/s. Nellie's recoil speed is
A. 0.55 m/s.
B. 1.2 m/s.
C. 0.45 m/s.
D. 0.83 m/s.
Answer: D
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