What is the accelerating force of a bullet in a 10cm gun barrel?

[Gradyjenkinz]

Homework Statement

[/B]A 10g bullet accelerates from rest to 500m/s in a gun barrel of length 10cm. Find the accelerating force (assuming it is constant).

Homework Equations

F=ma, v^2=vo^2+2a(x-xo)?

The Attempt at a Solution

I tried using F=ma, but it does not equal the answer in the back of the book.

 

[Issy04]

Have you converted the mass and length into kg and m? Then rearrange v²=vo²+2ax to find a. Then sub that into F=ma.

 

[Gradyjenkinz]

Have you converted the mass and length into kg and m? Then rearrange v²=vo²+2ax to find a. Then sub that into F=ma.

Oh jeez. Got it now, thank you. Gotta make sure I actually pay attention to units :(