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(a)A rock is tossed straight up with a velocity of 31.9 m/s. When it returns, it falls into a hole 12.1 m deep. What is

(a)A rock is tossed straight up with a velocity of 31.9 m/s. When it returns, it falls into a hole 12.1 m deep. 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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