Question

What is the velocity of an object with a kinetic energy of 800 J and a mass of 12 kg?

Answer 1

`Given:\\E_k=800J\\m=12kg\\\\Find:\\v=?\\\\Solution:\\\\E_k=(mv^2)/(2) \;\;\;/\cdot 2\\\\2E_k=mv^2\;\;\;/:m\\\\v^2=(2E_k)/(m) \;\;\;/\sqrt{} \\\\v=\sqrt{(2E_k)/(m)} \\\\v=\sqrt{(2\cdot 800J)/(12kg) } \approx 11,55(m)/(s)`