A father and his young daughter are on very clean ice, so there is very little friction (the father has more mass than the daughter). The father pushes his daughter forward and she slides away at a speed of 3 m/s. The father's velocity is
A. 3 m/s in the same direction as his daughter.
B. zero.
C. 3 m/s in the opposite direction as his daughter.
D. smaller than 3 m/s in the opposite direction as his daughter.
E. smaller than 3 m/s in the same direction as his daughter.
Answer: D
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