Question

Calculate the force (in N) needed to bring a 1050 kg car to rest from a speed of 80.0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop).

Answer 1

The force needed to bring the car to rest is 2685 N.

Step-by-step explanation:

To calculate the force needed to bring the car to a rest, we will use the equation:

F = (m*v^2)/(2*d)

Where F is the force, m is the mass of the car (1050 kg), v is the velocity of the car (80.0 km/h converted to m/s), and d is the distance (120 m).

Converting the velocity to m/s:

v = 80.0 km/h * (1000 m/1 km) * (1 h/3600 s) = 22.2 m/s

Plugging in the values, we get:

F = (1050 kg * (22.2 m/s)^2) / (2 * 120 m)

Calculating this gives us F = 2685 N.

Therefore, the force needed to bring the car to rest is 2685 N.