Posted by **Ama** on Monday, December 19, 2011 at 11:14am.

A 7.24 g bullet moving at 636 m/s penetrates a tree to a depth of 4.87 cm. Use energy considerations to find the average frictional force that stops the bullet. Answer in units of N

B) Assuming that the frictional force is constant how much time elapsed between the moment of the bullet entering the tree and moment it stopped? Answer is Seconds

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