d What force is required to stop a 1400 kg automobile travelling at 50.0 km/hr over a distance of 0.30 metres? What if the stopping distance is 1.5 m? (Note that this is why cars have crumple zones). What work is done in each case? A coiled spring is stretched by hanging known Force vs. Distance of Stretched Spring weights from its end, and the stretch is measured in metres. The graph shows how the force on the spring varies with the amount of stretch. 6 in Force (N) a) What is the spring constant for this spring? tm Nm b) How much force is required to stretch the spring 0.80 m? 0.1 0.2 0.3 0.4 0.5 0.6 c) How much work must be done to stretch the Distance (m) spring 0.50 m