Solving for Kinetic & Potential Energy: Help Needed

[Robb]

Homework Statement

Homework Equations

The Attempt at a Solution

Kinetic Energy + Potential energy=0

1/2mv^2 = mgcos(20)
100v^2 = 1.96cos(20)
v^2 = .0184
v = .136 m/s

No idea if this is correct or if I should proceed with energy considerations. Please advise.

 

[robphy]

Under the influence of gravity and the normal force of the incline, the resulting motion is not at constant velocity. Right?

There must be an additional force somewhere to balance the forces.
So, you are missing something.
Is there anything else given in the problem that can be used?

 

[Robb]

Thanks for the response. I got help in class last night!