Standing at the base of one of the cliffs cof Mt. Arapiles in Victoria, Australia, a hiker hears a rock break loose from a height of 125.0 m. He can't see the rock right away, but then does, 2.50 s later. (a) How far above the hiker is the rock when he can see it? (b) How much time does he have to move before the rock hits his head?

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