Construction workers were raising heavy steel beams up 10 meters, unfortunately, they dropped them. as the beams fell towards the ground the energy they possessed at 10 meters above the street was converted into energy.

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