- #1

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## Homework Statement

A 30 kg block is slid down an inclined plane 5 m long with a height of 3 m from the floor. If the force of friction is 50 N, find the work done by the friction and the final velocity at the end of the plane.

## Homework Equations

W = F*d

mgh = (1/2)mv^2

## The Attempt at a Solution

50 N * 5 m * cos(180) = -250 J

Incorrect

30 kg * 9.8 m/s^2 * 3 m = (1/2) * 30 kg * v^2

882 = 15*v^2

58.8 = v^2

v = 7.6681 m/s

Incorrect

I don't know how else to approach this.