Which two actions are examples of people doing work in the scientific sense? A. kicking a ball so that it rolls across the gym floor
B. lifting a heavy book from the floor to a desktop
C. leaning on a wall while taking a break
D. holding a glass of water still so that it doesn't tip
E. pushing on a weight that is too heavy to move

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