Homework Problem related to acceleration due to gravity and force.

AI Thread Summary
To determine the initial speed of a 10.0-g ball thrown straight down from a height of 2.0m, the relevant kinematic equation is vf² = vi² + 2gd, where vf is the final velocity (7.5 m/s), g is the acceleration due to gravity (9.8 m/s²), and d is the displacement (2.0m). The discussion highlights the importance of correctly applying the formula and paying attention to the signs in the calculations. Participants encourage each other to attempt the solution while ensuring proper understanding of the variables involved. The conversation emphasizes the need for clarity in the application of physics equations to solve the problem accurately.
Fanatic
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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
 
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Fanatic said:
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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