posted by C0C0 .
A 60 kg box is on a 80 m long plane which is inclined at 30 degrees, the coefficient of friction is 0.25. How much force is needed to move it up a plane A.) at a constant velocity and B.) with an acceleration of 2 m/s^2
net force up the plane: pushing force-weight down-friction
so figure out F, given a=0, or a=2