1. The problem statement, all variables and given/known data A box was dragged downward from the state of rest through an inclination 10.0 m at an angle of 25 degree. The speed when the box arrived at the base is 3 m/s. a) what is the coefficient force between the box and the surface? b) how many work is done to move the box downward and the work done by the friction force of the box? c) calculate the potential energy of the box. 2. Relevant equations 1) F net + mg sin 25 (F applied) = µmg cos 25 (F friction) F net = µmg cos 25 - mg sin 25 ma= µmg cos 25 - mg sin 25 a = µg cos 25 - g sin 25 2) V(final) ^2 = V(initial)^2 + 2ad 3) µ= F friction/ F Normal 3. The attempt at a solution By using the equation nom 2, I found the acceleration is 0.45 m/s/s (I assumed that initial velocity is 0). Then, I used nom 1 equation and got µ= 0.56. But I get stuck with the second question. I don't know if we can search the work done without knowing the mass and if I have to find the mass, I totally don't know how. Please help me. Thank you.