I don't know.
The Attempt at a Solution
I don't even know where to begin...
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http://img693.imageshack.us/img693/9601/screenhunter002d.jpg [Broken]A good starting point is to draw a free body diagram and identify the forces acting.
Then a second good step is to introduce a suitable coordinate system One wit hte x axis parallel to the inclined plane would do. Then choose a suitable y axis.
After you do that, you might want to write down Neton's second law of motion for those coordinate directions.
What do I do now?
I found the Force of Friction by doing Ff=uFn. 21*37.8=7.938
How do I find the speed?
Do I use:
But then to find the Vf, I need the distance and acceleration.
How do I find the distance and acceleration?
For the acceleration, I did.
a=g*sin(31) to get 5.047. That's the acceleration if there was no friction, right?
Then I used multiplied that by 4.5 to get the net force. I then subtracted the force of friction from the net force to get: 14.78
I divided the new net force by 4.5 to get 3.28 as the new acceleration.
Is that correct?