You are driving at 15 m/s towards a traffic light that is 200 m away when
it turns red. You instantly lift your foot off the gas pedal and start decelerating at
0. 5 m/s2. At this rate, will you stop before or after the light? At this rate, where will
you be when the light turns greens again, in 15 seconds? Should you start actively
braking or can you keep coasting?