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8 September, 23:44

A penny dropped into a wishing well reaches the bottom in 1.5 seconds. what was the velocity at impact?

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  1. 9 September, 00:10
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    At the surface of the Earth, the acceleration of all objects due to gravity

    is about 9.8 m/s².

    So an object that's acted on by no other forces except gravity increases

    its speed by 9.8 m/s every second.

    If the object is dropped from "rest" (zero speed), then after 1.5 seconds

    have passed, it's falling at (1.5 x 9.8) = 14.7 m/s.

    Its velocity is 14.7 m/s in the direction of straight down.
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