A 49.2-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2.08 m/s. Her hands are in contact with the wall for 0.756 s. Ignore friction and wind resistance. Find the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her). Note that this force has direction, which you should indicate with the sign of your answer.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”