# Homework Help: Homework Problem related to acceleration due to gravity and force.

1. Dec 20, 2011

### Fanatic

1. The problem statement, all variables and given/known data

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.

2. Relevant equations

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

3. 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
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Dec 20, 2011

### Staff: Mentor

That's an excellent way to solve this problem. Give it a shot. (Careful with signs.)
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