Assignment:
1. This question is from the Colorado State driver's license exam: A car at 30 miles per hour skids 40 feet with locked brakes. How far will the car skid with locked brakes at 90 miles per hour?
2. Suppose that you and two friends are discussing the design of a roller coaster. One friend says that each summit must be lower than the previous one. Your other friend says this is nonsense, for as long as the first one is the highest it doesn't matter what height the others are. Explain which one is correct and why.
3. When a jet plane lands on the deck of a carrier, is this an elastic or an inelastic "collision?" In this "collision" the before is just before landing and the after is after the plane has come to a stop.
4. In the measurement of v by the free-flight method, what would be the effect on the measurements if
a) the front of the launcher were lower than the rear?
b) the distance between the photogates was long enough to let the ball drop 1 cm between the photogates?