Three identical pucks, A, B, and C, are sliding across ice at the given speeds. The forces of air and ice friction are negligible.
a. Rank the pucks by the force needed to keep them moving, from greatest to least.
b. Rank the pucks by the force needed to stop them in the same time interval, from greatest to least.

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2 m/s 4 m/s 6 m/s B