In a roller coaster, a car has x joules of potential energy when it is resting at the top of the hill. the car moves downhill and reaches the bottom of the hill, where it moves quickly. assuming no friction, what does the law of conservation of energy predict about the car?

a)at the bottom, the car has x joules of potential energy.
b)at the bottom, the car has x joules of mechanical energy.
c)at the bottom, the car has more than x joules of kinetic energy.
d)at the bottom, the car has more than x joules of mechanical energy.

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.