Astudent pulls a rope attached to a box of books and moves the box down the hall. the student pulls with a force of 175n at an angle of 25.0º above the horizontal. the box has a mass of 35.0 kg and the coefficient of kinetic friction between the box and the floor is 0.280. find the acceleration of the box. 1.65 m/s² 2.38 m/s² 3.72 m/s² 9.37 m/s² four forces act on a hot air balloon as shown below. find the magnitude and direction of the resultant force on the balloon. show your work and explain your answer