Final answer:
To find the magnitude of the average net force required to stop a car, we can use the equation: F = m * a, where F is the net force, m is the mass of the car, and a is the acceleration. We can calculate the acceleration using the equation: a = (v^2 - u^2) / (2 * s), where v is the final velocity, u is the initial velocity, and s is the stopping distance. For part A, where the initial speed is 40.0 km/h and the stopping distance is 25.0 m, the magnitude of the net force is 2590 N.
Step-by-step explanation:
To find the magnitude of the average net force required to stop a car, we can use the equation:
F = m * a
where F is the net force, m is the mass of the car, and a is the acceleration. We can calculate the acceleration using the equation:
a = (v^2 - u^2) / (2 * s)
where v is the final velocity, u is the initial velocity, and s is the stopping distance.
For part A, where the initial speed is 40.0 km/h and the stopping distance is 25.0 m:
v = 0 m/s, u = 40.0 km/h = 11.11 m/s, and s = 25.0 m.
Substituting these values into the equations, we can calculate the magnitude of the net force to be 2590 N.