Question

A 0.40 kg soccer ball has 20 J of kinetic energy. How fast is it moving?

Answer 1

1/2 x m x v^2 = 20J
1/2 x 0,40 x v^2 = 20J
v^2 = 20/0,5x0,4
v^2 = 100
v = 10
it is moving at 10 m/s