A 3.0-g bullet traveling at 350 m/s hits a tree and slows down uniformly to a stop while penetrating a distance of 12 cm into the tree's trunk. What was the force exerted on the bullet in bringing it to rest?

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- July 12th 2006, 10:12 AM #1

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- July 12th 2006, 01:53 PM #2Originally Posted by
**Celia**

The work done on the bullet by the tree is going to be negative (consider the direction of the force and the displacement). I will assume an average force, so we may simply call the force constant. The final speed of the bullet is, of course, zero.

So the average force exerted by the tree over the 12 cm is about 1500 N.

-Dan