A football is thrown in the air. At what point does it have the highest
kinetic energy?

A. When it hits the ground.
B. Just before it hits the ground.
C. Just after it starts to fall.

You want to move a heavy box with mass 30.0 kg across a carpeted floor. you pull hard on one of the edges of the box at an angle 30∘ above the horizontal with a force of magnitude 240 n, causing the box to move horizontally. the force of friction between the moving box and the floor has magnitude 41.5 n . what is the box's acceleration just after it begins to move