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## Homework Statement

A 1000 kg roller coaser train is intially at the top of a rise, at point A. It then moves 135 ft, at an angle of 40 degrees below the horizontal, to a lower point B.

Choose the train at point B to be the zero configuration for gravitational potential energy. Find the potential energy of the roller coaster-Earth system at points A and B, and the change in potential energy as the coaster moves.

## Homework Equations

Ug=mgy

## The Attempt at a Solution

Y at Point A=86.8 m

Ug= 850640 Kj

This isn't the right answer, so where am I going wrong?