The tyre and spring help to reduce the effect of driving over any holes in the road surface. After being compressed the spring returns to its original length.
Describe the changes in energy stored as the car drives over the hole in the road

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