Question 1 You are standing with your 1,042-kg car at a red light. The light turns green, and you speed up your car to 30 mph. What is the total work done on your car?
Question 2 You are standing with your 1,283-kg car at a red light. The light turns green, and you speed up your car to 59 mph. Then you continue at a constant speed. After another mile, what is the total work done on your car from the moment you started from rest?
Question 3 You are standing with your 1,006-kg car at a red light. The light turns green, and you speed up your car to 49 mph over a distance of 54 m. Then you continue at a constant speed for another mile, until you encounter again a red light. You bring your car to a complete stop over a distance of 56 m. What is the total work done on your car from the moment you started from rest?
Question 4 You are driving your 1,185-kg car at a speed of 30 mph. A traffic light in front of you turns red and you bring your car to a complete stop. What is the total work done on your car?
Question 5 You are driving your 1,153-kg car at a speed of 44 mph. A traffic light in front of you turns red and and over a distance of 37 m you bring your car to a complete stop. Assuming a constant acceleration, what is the magnitude of the net force acting on your car, while you are applying the brakes?
You can solve this two ways:Employ the work-kinetic energy theorem. Use Newton's Law and the equations for motion at constant acceleration.