Physics Net Force Incline problem

[salmanamin]

A 2.0 kg mass starts from rest and slides down an inclined plane 8.0 x 10^-1 m long in 0.50 sec. What net force is acting on the mass along the incline?

Can someone please explain step by step in a descriptive way. I have a quiz tomorrow and I just can't even start this problem

 

[Simon Bridge]

Start the problem with a free-body diagram.
What forces are acting on the mass?
Which direction to they act?