# Ball Thrown

1. Oct 13, 2008

### 12boone

1. The problem statement, all variables and given/known data
A 0.20KG ball is thrown with a speed of 13 m/s at an angle of 32 degrees.

What is the speed at the highest point?

How high does it go? (Use conservation of energy, and ignores air resistance

2. Relevant equations

I think the kinematic equations but I am not sure.

3. The attempt at a solution

I was positive that the velocity of any projectile at the highest point would be zero, but this was not right in this problem. I think the problem has something to do with mechanical energy but I am not sure. Any suggestions for A? so that I can maybe find B.

2. Oct 13, 2008

### Hootenanny

Staff Emeritus
You're almost correct: the vertical component of the velocity will be zero at the highest point, but the horizontal component needn't be.

3. Oct 13, 2008

### Pyrrhus

In projectile motion at the highest point one of the components speed will be zero, but remember one of components will have constant value. Projectile motion is a mix of free fall and constant velocity movements.