A 14kg skater is standing still in front of a wall. By pushing against the wall

Question

A 14kg skater is standing still in front of a wall. By pushing against the wall she propels herself backwards with the velocity of -1.2m/s. Her hands are in contact with the wall for 0.80s. 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). A 14kg skater is standing still in front of a wall. By pushing against the wall she propels herself backwards with the velocity of -1.2m/s. Her hands are in contact with the wall for 0.80s. 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).

Explanation / Answer

F*t = impulse

F=impulse/t

F= mv/0.80

F= 14*(-1.2)/0.80=-21 N

magnitude of the force=21 N

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