# Energetic Bus Driver

A bus driver is driving at the speed of $$10\text{ m/s}$$. He seems to be at rest according to the passengers in the bus, so they conclude that the kinetic energy of the driver is zero.

However, the pedestrians on the road see the bus driver move with velocity $$10\text{ m/s}$$. They estimate his mass to be $$60\text{ kg}$$, and calculate his kinetic energy to be 3000 Joules.

Why have they found two different values of kinetic energy for the same driver?

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