# Concerning 83022

A man with a mass of 80 kg crosses at a speed of 5 m/s through the car of a train traveling at 15 m/s. Indeed, the kinetic energy of a man:

and, concerning the car

b, relative to the surface of the earth, if the man is traveling in the direction of travel of the train

c, relative to the surface of the earth, if the man is traveling in the opposite direction of the train

and, concerning the car

b, relative to the surface of the earth, if the man is traveling in the direction of travel of the train

c, relative to the surface of the earth, if the man is traveling in the opposite direction of the train

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