1. At an accident scene on a level road, investigators measure a car's skid marks to be 88.0 meters long. The accident occurred on a rainy day, and the coefficient of kinetic friction was estimated to be 0.420. What was the speed of the car when the driver slammed on the brakes?
2. You have heard of Iron Man...well his cousin is Zinc Man. Zinc Man has a rocket pack strapped to his suit. He starts from rest and accelerates straight upward from the ground. At a height of 16.0 meters he has a speed of 5.00 m/s. His mass including his Zinc Man suit is 136 kg. How many joules of energy have been done to Zinc Man by his rocket pack?