A3 kg box is being pushed with a constant force and speed. What force is
preventing the box from accelerating?
OA) the normal force
OB) the force of friction
OC) the weight of the box
OD) the constant pushing force

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.