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That is nitpicking IMO. You are free to reword the details. The
point is that many students turn off their brains and answer with a
negative acceleration.
On Sun, 28 Jul 2002, John Mallinckrodt wrote:
>1. The same skier comes off the hill and stops on a level spot. Her> skier is initially at rest (which the problem seems to be clear
>friend pushes the skier forward with a force of 15.0 N. Find the
>skier's acceleration. (The coefficient of friction was given as
>.0500, the skier's mass as 75.0 kg).
<NITPICK> I think we may have discussed this one before. My best
answer would be that the problem is ill-posed. Assuming that the
> about), then her friend may "push on the skier's back" with a force
of 15 N but her friend can't "push the skier forward" with a force> that small.</NITPICK>