Homework Help: Box on a Frictionless Incline

1. Jan 26, 2010

Elo21

1. The problem statement, all variables and given/known data

A 12 kg box is being held on a 23 degree frictionless incline. Find the box's equation once released.

2. Relevant equations

Net force=ma

Fpull-Fparallel=ma

3. The attempt at a solution

12kg x 9.8m/s = 117.6 N

(Fpull-mgsin23)= ma

sub. known values in

117.6 N-(117.6N (sin23))= 12kg x a

a$$\rightarrow$$equals about 6.0 m/s

I know I am doing something wrong. I am reviewing for a final, and am trying to remember things. Please help me figure out what I did wrong.
THANK YOU!!! :)

2. Jan 26, 2010

dacruick

i think its cos23 instead of sign.