# Homework Help: Work of gravitational attraction based on height

1. Feb 16, 2012

### aarop2

1. The problem statement, all variables and given/known data
i need to find the work of gravitational attraction based on heights of balls being shot into the air. the mass of the ball is 24 grams, the height is 27cm at 0 degrees, 38 at 30 degrees, 50 at 45 degrees, 61 at 60 degrees, 80 at 90 degrees.
i also need to find the initial velocity of a ball going up at a 90 degree angle.

2. Relevant equations

3. The attempt at a solution
i have absolutely no idea how to do this i don't need the answers but i do need to learn how to do this.

2. Feb 16, 2012

### PhanthomJay

Your problem statement is unclear. Do you want to find the work done by gravity when it reaches its max height? Or when it hits the ground? And if its max height is 27 cm when the gun is fired at 0 degrees, the gun must be positioned 27 cm above ground when it is fired.

You should also provide your thoughts on what equations may come into play.