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Q. A 140 g air-track glider is attached to a spring. The glider is pushed in 12.00 cm and released. A student with a stopwatch finds that 9 oscillations take 10.0 s
what is the spring constant?

Q. Heather and Jerry are standing on a bridge 42.0 above a river. Heather throws a rock straight down with a speed of 16. Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Overlook air resistance.

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