Question

What is the mass of a ball rolling at 5.00m/s if it has 3.00J of kinetic energy?

Answer 1

Answer:

Explanation:

The equation for Kinetic Energy is

$KE=\frac{1}{2}mv^2$ and we know everything but the mass of this ball. Filling in:

$3.00=\frac{1}{2}m(5.00)^2$. Get everything isolated from the :

$m=\frac{2(3.00)}{(5.00)^2}$ which tells us that we need 3 significant digits in our answer.

m = .240 kg since mass is always in kg i the velocity is in meters/sec