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## Homework Statement

Bill throws a 10.0-g ball straight down from a height of 2.0m. The ball strikes the floor at a speed of 7.5m/s. What was the initial speed of the ball.

## Homework Equations

Can you provide the proper formula and solution to solve this problem?

## The Attempt at a Solution

I tried using the following formula, but realized it was probably wrong.

vf2= vi2 +2gd

Vf and vi are to the second power

g= gravity acceleration 9.8

d- displacement