A rock is tossed straight up from ground level with a

Chapter 2, Problem 2.66

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A rock is tossed straight up from ground level with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. a. What is the rocks velocity as it hits the bottom of the hole? b. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?

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