Homework Help: physics

Posted by Nilan on Sunday, February 20, 2011 at 3:06pm.

a bullet with a mass of 5 g and a speed of 600 m/s penetrates a tree to a depth of 4 cm. Assume that a constant frictional force stops the bullet.

Calculate the magnitude of this frictional force.

*Also, I'm not sure if the answer would be positive or negative.

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