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1. ssm A 46-kg skater is standing still in front of a wall. By pushing against the wall she
propels herself backward with a velocity of -1.2 m/s. Her hands are
in contact with the wall for 0.80 s. Ignore friction and wind resistance.
Find the magnitude and direction of the average force she exerts on the wall
(which has the same magnitude as, but opposite direction to, the force that
the wall applies to her). |
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Impulse-Momentum
Theory says |
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Since she was at rest at first |
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This average force is the
force the wall is acting on the skater, so the force of the skater on the
wall is the opposite of this. |
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