A worker drags a crate across a factory floor by pulling on a rope tied to the crate. The worker exerts a force of magnitude F = 450N on the rope, which is inclined at an upward angle θ = 38o to the horizontal, and the floor exerts a horizontal force of magnitude f = 125N that opposes the motion. Calculate the magnitude of the acceleration of the crate if

(a) Its mass is 310 kg and

(b) Its weight is 310 N