Q1. A 25.0g arrow is shot through a 7.8 cm apple. If the arrow enters the apple at 38.8 m/s and emerges with a speed of 30.10m/s in the same direction, what is the magnitude of force with which the apple has resisted the arrow?
Q2. A pendulum bob has potential energy uo while held taut in a horizontal position. The bob falls until it is 19 degrees away from the horizontal position, while it has potential energy ua . It continues to fall until the string is vertical, when it has potential energy ub. Compare its potential energies at a, b, and o.