A 1500 kg rollercoaster starts at the top of a frictionless hill with 200,000 J of gravitational potential energy and 50,000 J of kinetic energy. As the rollercoaster reaches the bottom of the hill, it now has 220,000 J of kinetic energy. Calculate the gravitational potential energy of the rollercoaster at the bottom of the hill.

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i just did this and got a 100.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.