To calculate the force Kelly was pushing with, we can use the equation:
Work (W) = Force (F) × Distance (d)
Given that Kelly does 600 J of work and pushes the cow 4 meters away, we can rearrange the equation to solve for force:
F = W / d
Plugging in the values, we get:
F = 600 J / 4 m
F = 150 N
Therefore, Kelly was pushing with a force of 150 Newtons.