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## Homework Statement

a 1000kg roller coaster car is initially at to of a rise, a point A. it then moves 135ft, at an angle of 40degrees below the horizontal, to a lower point B. choose the car at point B to be zero configuration for gravitational potential energy of the roller coaster-Earth system. find the potential energy of the system when the car is at points A and B and the change in potential energy as the car moves.

## Homework Equations

U=mgh

## The Attempt at a Solution

i tried to do 1000*9.8*135

i do not get the right answer. can someone please guide me through step by step how to solve this question. help would be appreciated thx.