Desde un edificio de 10.0 [m] de altura se lanza un proyectil, con una velocidad inicial de 5.0 [m/s] formando un ángulo de 30° con la horizontal.

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