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Bullet and Wood Block

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A bullet is fired horizontally into a wood block resting on a horizontal, frictionless surface. If the mass of the bullet is 0.02 Kg and the velocity is 600 m/s, what is the velocity of the wood block after the bullet is embedded in it? Assume the wood block has a mass of 50 kg.

a. 1 m/s
b. 2 m/s
c. 2.5 m/s
d. 0.24 m/s

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https://brainmass.com/engineering/mechanical-engineering/bullet-wood-block-problem-83318

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Solution briefly shows the calculations necessary to pick from the multiple parts of this ballistics questions.

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bullet hitting a wooden block

A bullet with a mass of 3.00 g, traveling horizontally with a speed of 420 m/s, is fired into a wooden block with mass of 0.840 kg , initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 180m/s . The block slides a distance of 48.0 cm along the surface from its initial position.

A) What is the coefficient of kinetic friction between block and surface?

B) What is the decrease in kinetic energy of the bullet?

C) What is the kinetic energy of the block at the instant after the bullet passes through it?

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