1. A 3 kg object slides for 5 m down an incline which is at 40 degrees. the coefficient of friction on the incline is 0.15 use work and energy methods to find the speed of the mass at the bottom of the incline.
2. 2000 kg elevator is accelerated uniformly from rest to 4 m/s in a time of 90s. During this time the elevator rise a distance of 15 m a find the change in mechanical energy of the elevator during this time find the average power used to move the elevator