Give the answer for the question below mathematically: (a) You wish to move a square box (0.3m by 0.3m) by 1m across a pavement. Given that the box has of mass of 80kg Will you use more energy if you slide or roll it? Why? The coefficient of friction between the pavement and the box is 0.6 (Hint consider the energy used to roll equals to the work done raising the centre of mass) Gravity=9.81m/s2 (10 marks) (b) Based on the above what would be the value of the coefficient of friction that you will use the same energy either roll or slide to move the box by the length of the box? (10 marks)