The distance between the roller coaster and the earth increases and resulting in an increase in friction.
As we move up into the hill the speed of the roller coaster decrease as it's far away from the surface and hence the impact of gravity is the least upwards and is most when going downwards.
Thus the increase of the distance between the earth and coaster will result in the generation of the momentum and the coaster will come down with great speed due to the gravitational attraction.
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