Question

what is the speed of a 0.145 kg baseball if its kinetic energy is 109 J?

Answer 1

E_k = 1/2 * m * v^2
109 J = 1/2 * (0.145kg) * v^2
(109 J)(2)/(0.145 kg) = v^2
v = sqrt((109 J)(2)/(0.145 kg))
v = 38.77 m/s