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## Homework Statement

A ball is dropped from the top of a building and falls vertically downwards. Air resistance can be neglected. After falling a distance d, the speed of the ball is v. Determine the speed of the ball (in terms of v) when it has fallen a distance of 2d.

## Homework Equations

## The Attempt at a Solution

We tried to isolate for V

_{2}and d and then substitute them into each other but that didn't work. Please help!