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A rock is tossed straight up from the ground with a speed of 12  m/s . When...

A rock is tossed straight up from the ground with a speed of 12  m/s . When it returns, it falls into a hole 10 m deep. What is the rock's speed as it hits the bottom of the hole? 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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