Imagine riding in a glass-walled elevator that goes up the outside of a tall building at a constant speed of 20 meters per second. As you pass a window washer, he throws a ball upward at a speed of 20 meters per second. Assume, furthermore, that you drop a ball out a window at the same instant.
a. Describe the motion of each ball from the point of view of the window washer.
b. Describe the motion of each ball as you perceive it from the reference system of the elevator.
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