Consider the falling backpack described in Exercise 61 from the reference system of an observer standing along the side of the track. Find the initial kinetic energy, the final kinetic energy, and the change in kinetic energy. How do the changes in kinetic energy compare in the two cases?
Reference of exercise 61
A person riding a train at a constant speed of 30 m/s drops a 2-kg backpack from a height of 1.25 m. The fall requires half a second and the backpack acquires a vertical velocity of 5 m/s. Find the initial kinetic energy, the final kinetic energy, and the change in kinetic energy from the reference system of an observer on the train.
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