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Erika is on an elevator and presses the button to go down.
When the elevator first begins moving, it has an acceleration of 2.5 m/s2 downward.
Erika and the elevator have a combined mass of 1250 kg.
a) Draw a free-body diagram for the elevator.
b) What is the tension in the cable that provides the upward force on the elevator car?
Twin paradox: One of the most popular "paradoxes" in history, predicted trhough A. Einstein's special theory of relativity. Take two twins, born on the similar date on Earth.
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