- #1

nickclarson

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## Homework Statement

A block of mass 3.16 kg, starting from rest, is pulled up a frictionless inclined plane that makes an angle θ = 27.1° with the horizontal by a string parallel to the plane. The tension in the string is 45.8 N. After traveling a distance 2.12 m, the speed of the block is 3.37 m/s. Find the work done by the tension force.

## Homework Equations

[tex]U=mgh[/tex]

[tex]W = KE_{f} - KE_{i}[/tex]

## The Attempt at a Solution

I came up with:

[tex]KE_{i} + U_{i} = KE_{f} + U_{f}[/tex]

[tex]0 + 0 = KE_{f} - U_{f}[/tex]

so since I am looking to find the final kinetic energy which is equal to work...

[tex]KE_{f} = -U_{f} = -mgh[/tex]

but positive because W is positive.

I got the wrong answer though and I could be way off, could somebody point me on the right track?

Thanks,

Nick