I dont get them and they seem to easy

You will want to start by looking at the forces or force components that are either pushing the block upward along the incline or pulling it downward.

Since the block is moving at constant speed along the incline, what does that tell you about the balance of forces along the incline?

 

Oh, you have to solve this using work and energy, rather than forces?

All right, what forces are acting along the incline? You need to know that in order to know what kind of work is being done.

 

Since the block is moved with constant velocity, there is no net force acting on it.

 

Mechanical energy wont be conserved, some if it will be dissipated into heat since there's friction.

I don't see how you're going to solve the problem using energy with the values you were given.