The ballistic pendulum is a device used to measure the speed of a fast-moving projectile such as a bullet. The bullet is fired into a large block of wood suspended from some light wires. The bullet is stopped by the block, and the entire system swings up to a height h. (a) Determine the ratio of the momentum immediately after the collision to the momentum immediately before the collision. Pf =  Pi (b) Show that the ratio of the kinetic energy immediately after the collision to the kinetic energy immediately before the collision is

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