a student pulls a box of books on a smooth horizontal floor with a force of 100 n in a direction of 37e above the horizontal. if the mass of the box and the books is 40.0 kg, what is the acceleration of the box?a student pulls a box of books on a smooth horizontal floor with a force of 100 n in a direction of 37e above the horizontal. if the mass of the box and the books is 40.0 kg, what is the acceleration of the box?