Q. A flat sheet of ice (n = 1.309) has a thickness of 2.7 cm. It is on top of a flat sheet of crystalline quartz (n = 1.544) that has a thickness of 0.99 cm. Light strikes the ice perpendicularly and travels through it and then through the quartz. In the time it takes the light to travel through the two sheets, how far (in cm) would it have traveled in a vacuum?
Q. A flea jumps straight up to a maximum height of 0.470 m. What is its initial velocity v_0 as it leaves the ground?