At point A the roller coaster car has 480 Joules of gravitational potential energy. At point C it only has 290 Joules of gravitational potential energy. How much kinetic energy does the car have at point C? Select one:
480 Joules
0 Joules
190 Joules
290 Joules

Answer body lying face up ;

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

The correct answer is  ait's a process by which rocks and minerals undergo in their composition^o^

Answerporcelain