(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If a .5kg ball is thrown up in the air and reaches a height of 20 meters.

A)What is the ball's Kinetic Energy?

B)What is its initial velocity, as it leaves the thrower's hand?

C)What is its velocity at 16 meters?

2. Relevant equations

KE=1/2mv^2

3. The attempt at a solution

Okay so for the first one I'm thinking I need to use KE=1/2mv^2, I have the mass but I need the velocity to solve for the kinetic energy. So then I thought maybe the velocity would just be 0 because it says "as it leaves the thrower's hand" as in the split second when its not moving?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Projectile motion

**Physics Forums | Science Articles, Homework Help, Discussion**