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A thin block of soft wood with a mass of 0.076 kg rests on a horizontal...

A thin block of soft wood with a mass of 0.076 kg rests on a horizontal frictionless surface. A bullet with a mass of 4.67 g is fired with a speed of 613 m/s at a block of wood and passes completely through it. The speed of the block is 20 m/s immediately after the bullet exits the block.

(a) Determine the speed (in m/s) of the bullet as it exits the block.

_ m/s

(b) Determine if the final kinetic energy of this system (block and bullet) is equal to, less than, or greater than the initial kinetic energy. (choose 1)

equal to the initial kinetic energy

less than the initial kinetic energy

greater than the initial kinetic energy

(c) Verify your answer to part (b) by calculating the initial and final kinetic energies of the system in joules.

KEi = J

KEf = J

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