A bullet with mass m and speed v penetrates a tree a distance d. a) Find the average friction force that stops the bullet. b) Assume that the force of friction is constant, and determine the time it takes for the bullet to come to rest.

Physics for Scientists and Engineers: Foundations and Connections
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Chapter5: Newton's Laws Of Motion
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A bullet with mass m and speed v penetrates a tree a distance d.

a) Find the average friction force that stops the bullet.

b) Assume that the force of friction is constant, and determine the time it takes for the bullet to come to rest.

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