A straining man wearing a gray shirt is throwing a javelin with great force .
The man is running .
A straining man wearing a gray shirt is throwing a javelin with great force.
The man is running.
A man who is running has half the kinetic energy of the boy of half his mass.The man speeds up by1m/s and then has the same kinetic energy as the boy.
A man who is running has half the kinetic energy of the boy of half his mass.The man speeds up by1m/s and then has the same kinetic energy as the boy .