A car rolls down a driveway

So a 2000-kg car rolls down a 20 degree sloped 20m driveway. With no other outside forces, what is it's speed when it reaches the bottom?

Accelerating force = 2000*9.8*sin20
Accn = F/m = 9.8*sin20
v^2=u^2+2as=0+2*9.8*sin20*20
solve for v (m/s)