The determined Wile E. Coyote is out once more to try to capture the elusive roadrunner. The coyote wears a new pair of Acme power roller skates, which provide a constant horizontal acceleration of 15 m/s2, as shown in Figure P3.73. The coyote starts off at rest 70 m from the edge of a cliff at the instant the roadrunner zips by in the direction of the cliff. (a) If the roadrunner moves with constant speed, fi nd the minimum speed the roadrunner must have to reach the cliff before the coyote. (b) If the cliff is 100 m above the base of a canyon, fi nd where the coyote lands in the canyon. (Assume his skates are still in operation when he is in fl ight and that his horizontal component of acceleration remains constant at 15 m/s2.)

Alyssa Montgomery Design Internal Assessment Running Shoes: Friends or Foes Research Question: What effect does the thickness of the shoe’s sole have on the amount of force being transferred to the runner’s knee Hypothesis: If the thickness of the shoe’s sole is increased, then the force applied to the runner’s knee will be less. The theory behind this experiment is that since force is equal to the change in momentum over the change in time, by keeping the momentum of the foot the same but increasing the time that it takes for that force to be applied, then the force will decrease because by dividing by a larger period of time over a constant momentum will cause the quotient to be smaller. Variables: Manipulated Va