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11. The ballistic pendulum (see the figure below) 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. m+m V1i 2 (a) Determine the ratio of the momentum immediately after the collision to the momentum immediately before the collision pr Pi (b) Show that the ratio of the kinetic energy immediately after the collision to the kinetic energy immediately before the collision is m,/(m +m). (Submit a file with a maximum size of 1 MB.)

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