Posted by nora on Sunday, July 13, 2008 at 4:27am.
They are asking for the acceleration of the skater, not that of the wall (which does not move).
F = 25 N is applied TO the skater by the wall, and there are no other significant horizontal forces applied to her, because the skates eliminate friction.
Use F = m a to compute her acceleration, a. m = 50 kg
a = F/m = ?
The answer is one of the choices
the answer is b.0.5 m/s/s.
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