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21) 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 0.8 s. Ignore friction and wind resistance
• Find the magnitude and direction of the average force she exerts on the wall (which is the same magnitude, but in the other direction, as the force that the wall applies to her)
- - 69 N 69 N 69 m/s -69 m/s

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