Object sliding down a slope

1. The problem statement, all variables and given/known data
An object slides down a slope of 30° to the horizontal with CONSTANT VELOCITY.
Find the force of friction and the energy lost on the way down.

2. Relevant equations
[tex]\mu m g \cos \theta[/tex]
[tex]\mu m g \cos \theta – m g \sin \theta = 0[/tex]
[tex]W = K_2 + U_2 – (K_1 + U_1) [/tex]

3. The attempt at a solution
I tried the following:

[tex] \mu mg \cos30 = mg \sin30 = \mu = tan30 \cdot m = 3,3 \cdot m[/tex]

So the ratio is [tex]3,3m[/tex]? It doesn’t sound right…
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

http://ift.tt/1jmIfn2

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