Standing at the base of one of the cliffs of Mt. Arapiles in
Victoria, Australia, a hiker hears a rock break loose from a
height of 105 m. He can’t see the rock right away but then
does, 1.50 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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