While going down a roller coaster 20 m above the ground, a 100kg man is moving at 10 m/s  What is the GPE, KE, EPE, and total ME of the man.

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.