A horse pulls a cart horizontally with a force of 60lb at an angle of 30o above the horizontal and moves along at a speed of 8mile per hour. How much does the horse do in 15minutes and what is the power of output of the (1hp = 550ft-lb/s), (1mile = 5280ft).

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?