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At the low point of the ride the potential energy is zero

A roller-coaster car has a potential energy of 441 000 J and a kinetic energy of 112 800 J at point A in its travel. At the low point of the ride, the potential energy is zero, and 46 000 J of work have been done against friction since it left point A.

What is the kinetic energy of the roller coaster at this low point?

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Physics: At the low point of the ride the potential energy is zero

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