A 30 kg kid slides down a 35 degree incline with a coefficient of friction of 0.09. Find the kids acceleration.

We know the kid's mass, so to find the acceleration you just need to find the net force, then use f=ma.

There are two forces acting simultaneously. First is the force of gravity causing the kid to slide down the ramp. Can you calculate that force?

The second force the frictional force counteracting the downward slide. That force will be equal to the coefficient of friction times the component of the gravitational force perpendicular to the incline. Can you calculate it?

Post back with your attempt at calculating those forces. If you don't know how, let me know. I can explain it.