- #1

kittymaniac84

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## Homework Statement

A 78.9-kg skier rides a 3150-m-long lift to the top of a mountain. The lift makes an angle of 11.9 ° with the horizontal. What is the change in the skier's gravitational potential energy?

## Homework Equations

W=mgcos[tex]\theta[/tex](ho-hf)

## The Attempt at a Solution

W=78.9*9.8*cos11.9*(0-3150)=-264,810.95J

I am confused if the angle i used was correct or should i subtract it from 90 or something. I tried that and it was still wrong. Can someone tell me what I am doing wrong? is the angle used right