A rock is thrown (not dropped) straight down from a bridge into the river below. At...
A rock is thrown (not dropped) straight down from a bridge into the river below. At each of the following instants, is the magnitude of the rock's acceleration greater than g, equal to g, less than g, or 0? Explain?
a. immediately after being released.
b. just before hitting the water.
Homework Answers
(a) The magnitude of the acceleration while in free fall is equal to g=9.8 m/s2 at all times independent of initial velocity. So acceleration of the rock will be equal to g.
(b) The magnitude of the acceleration of the rock is still equal to g, because the rock is still in free fall (just before hittin the water). So the acceleration of the rock will be equal to g.
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