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## Homework Statement

A 70.0 kg skier rides a 2700 m long lift to the top of a mountain. The lift makes an angle of 14.3° with the horizontal. What is the change in the skier's gravitational potential energy?

in Joules

## Homework Equations

## The Attempt at a Solution

I can't seem to find why Ef * s = mas

does not work?

i've tried using the equation for an answer and it doesn't seem to give me the right answer.