It is a snowy winter day, and Pam is going tubing. In this context, that means Pam is going to slide down a snowy hill on an inner tube, and then go up the hill and do it all again. For this problem, use g = 9.80 m/s2.

Pam and the tube have a combined mass of 60.0 kg. Pam starts from rest at the top of the hill, and slides down to the bottom. The top of the hill is 8.80 m higher than the bottom. If there were no resistive forces acting on Pam and the tube on the way down, what would her speed be at the bottom of the hill? _______ m/s

It turns out that Pam's speed at the bottom of the hill is actually 5.50 m/s. Calculate how much work was done by non-conservative forces acting on Pam and the tube between the top and the bottom. _______ J

The bottom of the hill is flat. Unfortunately, Pam and her tube collide with a large tube that holds Michael and Dwight, who are arguing about who has to pull the other up the hill. The tube has a combined mass of 150 kg, and is at rest before the collision. Pam's speed before the collision is given in part (b). The collision causes Pam and her tube to reverse direction, and rebound with a speed of 1.50 m/s. Determine the speed of the large tube after the collision. _______ m/s

Kinetic energy is not conserved in this collision. What percentage of the kinetic energy that Pam and her tube had before the collision is still in the system after the collision? By system, we mean the two tubes and three people. _______ %