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Homework Problem related to acceleration due to gravity and force.

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1. 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.

2. Homework 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. Homework Statement



2. Homework Equations



3. The Attempt at a Solution
 

Answers and Replies

Doc Al
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I tried using the following formula, but realized it was probably wrong.
vf2= vi2 +2gd
That's an excellent way to solve this problem. Give it a shot. (Careful with signs.)
 

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