A boy pushes on a box of mass 39 kg and it moves at an acceleration of 7.8m/s2. With what force does the boy push on the box?

To determine the force exerted by the boy in the box, we use Newton's second law of motion. It is expressed as Force = (m) (a) where m is the mass and a is the acceleration. We calculate as follows:

F = m a

F = 39 kg (7.8 m/s^2)

F = 304.2 N

F = ma, where m is the mass of the body and a its acceleration.

So F = 39x7.8 = 280.8 N