QUESTION 7 An object of mass 68 kg is sliding down a rough inclined plane that makes an angle of 35 with the horizontal. A pushing force P against the object parallel to the plane keeps the object to accelerate downwards at 1 m/s. Given the frictional force is 100 N. Find the coefficient of friction and the magnitude of P. (4 marks) QUESTION 4 An object of mass 30 kg is attached to two light and inextensible strings, S1 and S2. The both end of the strings are then attached to a ceiling and a wall, respectively as shown below. If the system is in equilibrium, determine the tension of each string using Lami's Theorem (use g = 9.81ms-). ceiling S1 130 wall S2 70 (5 marks)