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

A 0.13 kg ball moves at a rate of 20.0 m/s at the point where it is 5.00 m above the ground. How much mechanical energy does the ball have with respect to the ground?

2. Relevant equations

Ek = 1/2mv^2

3. The attempt at a solution

Ek = 1/2mv^2

Ek = 1/2(0.13kg)(20m/s)^2

E = 26 J

The assignment says my answer should be 32.4 J.

Obviously, I am doing something wrong, but I'm not sure how to incorporate the "with respect to the ground" bit into my equations.

Somebody offer me some guidance, please?

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

Dismiss Notice

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!

# Mechanical Energy

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