Homework Help: physics

Posted by kb on Tuesday, October 14, 2008 at 9:09pm.

A 45 kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of -1.0 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, but opposite direction, as the force that the wall applies to her).

physics - bobpursley, Tuesday, October 14, 2008 at 9:14pm
Impulse = changeinMomentum
force*time=mass*changeinvelocity

Now note: it is the wall which pushes her, so the wall force is in the direction of her motion. The force she exerts is opposite to the wall.
physics - kb, Tuesday, October 14, 2008 at 9:19pm
thank you

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