Please answer all questions with tidy and neat diagrams accompanying detailed workout steps. Would prefer if you can write the answer digitally.

2 simple questions:

QUESTION 4 (20 marks) (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=9.8 lm/s* (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) Im - > Direction Sliding " ~. . Rolling QUESTION 5 (20 marks) Airport luggage delivery system consists of a conveyer belt that carries 15-kg travel bag to the top of a Shute 3 metres long and inclined at 25 to the horizontal. At the bottom of the Shute a pair of rubber barrier slow the bag before passengers can pick up. If the bag has an initial horizontal velocity of 50 cm/s when it reaches the slide and the coefficient of friction is 0.1, calculate the velocity with which the bag hit the barrier