A horizontal force of 200 N is applied to a 55-kg cart across a 10-m level surface. If the cart accelerates at 2.0 m/s', then what is the work done by the force of friction as it acts to retard the motion of the cart? (-900 J) A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision? (7/16) A 1 200-kg automobile moving at 25 m/'s has the brakes applied with a deceleration of 8.0 m/s-. How far does the car travel before it stops? (39 m) A 10.0-kg box starts at rest and slides 3.5 m down a ramp inclined at an angle of 10 with the horizontal. If there is no friction between the ramp surface and crate, what is the velocity of the crate at the bottom of the ramp? (3.5 m/s) A hill is 100 m long and makes an angle of 12" with the horizontal. As a 50-kg jogger runs up the hill, how much work does gravity do on the jogger? (-10 000 J)