Homework Help: AP Physics

Posted by Deanna on Sunday, December 5, 2010 at 6:01pm.

I have two problems i don't understand if you could solve and show me what you did I would appreciate it :)
1.A 62.0-kg person, running horizontally with a velocity of +3.54 m/s, jumps onto a 13.4-kg sled that is initially at rest.
(a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away.(b) The sled and person coast 30.0 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow?
2.A golf ball strikes a hard, smooth floor at an angle of θ = 29.4° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.055 kg, and its speed is 45 m/s just before and after striking the floor. What is the magnitude of the impulse applied to the golf ball by the floor? (Hint: Note that only the vertical component of the ball's momentum changes during impact with the floor.)

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