marks each) 1. For each of the following situations, state whether work is done on the object and explain why or why not. (8 marks - 2 a. A woman, walking at a constant velocity, carries a golf bag by exerting an upward force on it. The golf bag is moving horizontally as the woman walks. b. A man exerts an upward force on a briefcase to lift it onto his desk. c. A baby stroller is pushed along a horizontal sidewalk by a man who exerts a horizontal force. d. A normal force is exerted by a road on a car accelerating away from an intersection. 2. A weight-lifter is lifting a mass of 115 kg. a. What is the force required to lift this mass at a constant velocity of 0.330 m/s upward? (5marks) b. As the mass is lifted a distance of 0.64 m, what is the work done by the upward force? (5 marks) c. As the mass is lifted a distance of 0.64 m, what is the work done by gravity? (2 marks)