# How to find the force of a bullet?

A bullet of mass 0.0018 kg initially moving at 486 m/s embeds itself in a large fixed piece of wood and travels 0.54 m before coming to rest. Assume that the acceleration of the bullet is constant.

What force is exerted by the wood on the bullet? (in Newtons)

### 3 Answers

- 1 decade agoFavorite Answer
There is no force from the wood, it only provides absorption and distribution of the power inherent it the projectile. It is a passive resistance. This resistance can be measured by various means and instruments that take into account target mass. vs impact velocities.....I think.

- CatenaryLv 51 decade ago
F = ma

the mass of the bullet is 0.0018kg

the acceleration is found by solving the following formula for a

v² = u² + 2as

a = (v² - u²)/2s

the final velocity (v) = 0

the initial velocity (u) = 486m/s

the distance (s) = 0.54m

Solve this for a then solve the initial equation.

- 1 decade ago
F=ma. Repeat the mantra...

F=ma. F=ma.

Bullet. Know m. Check.

Goes from 486 m/s to 0 in 0.54m. Use the V² formula. Know now a. Check.

F=ma. Now know force.