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A rock is tossed straight up with a speed of 18 m/s. When it returns, it...

A rock is tossed straight up with a speed of 18 m/s. When it returns, it falls into a hole 8 m deep. In other words, assume that the rock lands 8 m lower than the height from which it was thrown. Take "up" to be the positive direction for this problem.

(1) What is the rock's velocity as it hits the bottom of the hole?
(2) 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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