Fill in the blank. a) 1) "An object moves with a velocity that is constant in magnitude and direction unless a non-zero net force acts on it". This is the statement of . Law. (1 mark) b) A constant force acts on a 7.0 kg object moving to the right, and reduces its velocity from 10.0 ms" to 6.0 ms" in a time of 3.0 s. Calculate the magnitude of the force and its direction. (3 marks) c) Two objects, each of mass, m,= 55 kg and my = 120 kg, are tied to a light string and at rest on a smooth horizontal floor as shown in Figure 3. Both objects are moving with acceleration of 4.0 m/s', after being pulled by a horizontal force, F. a = 4.0 m/s ma T 120 kg 55 kg F Figure 3 Determine: i) The horizontal force, F. (3 marks) The tension, T (2 marks) d) Box A with mass, m,= 10 kg and box B with mass, my = 15 kg are connected by a light string that passes over a massless, frictionless pulley as shown in Figure 4. The coefficient of kinetic friction between box A and the table is 0.10. 10 kg Smooth pulley Rough table String B 15 kg Figure 4 Draw the free body diagrams for the two boxes, (4 marks) Calculate the acceleration of the system, (5 marks) iii) Calculate the tension in the string. (2 marks)