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A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 22.0 m. She pushes in a direction 29.0-degrees below the horizontal. A 48.0-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that the shopper exerts? Determine the work done by (b) the pushing force, (c) the frictional force, and (d) the gravitational force.

I know this is a relatively simple problem, but I missed most of class when we were discussing this stuff. So if someone could start me off on the right foot, I'm sure I'll be able to figure it out.

What I tried so far was drawing a free-body diagram then making net force equations for the X and Y directions--but I haven't had any luck doing that. I must be missing something? Either that or I'm going about this completely the wrong way.

A timely reply is appreciated--I have class in about an hour.

Thanks!