A girl is standing at the edge of a cliff 145 m above the


A girl is standing at the edge of a cliff 145 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.79 m/s.

a) How long does it take the rock to hit the ground?

b) What is the speed of the rock the instant before it hits the ground?

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Physics: A girl is standing at the edge of a cliff 145 m above the
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