The minimum stopping distance for a car traveling at a speed of 30 m/s is 60 m, including the distance traveled during the driver’s reaction time of 0.50 s.

a. What is the minimum stopping distance for the same car traveling at a speed of 40 m/s?

b. Draw a position-versus-time graph for the motion of the car in part a. Assume the car is at x₀ = 0 m when the driver first sees the emergency situation ahead that calls for a rapid halt.