A 1100 kg car traveling at 27 m/s starts to decelerate and comes to a complete stop in 578.0 m.What is the average braking force acting on the car?
A)-690 N
B)-550 N
C)-410 N
D)-340 N

Question

Quizplus · Accepted Answer

The average braking force acting on the car can be calculated using the formula:F = mawhere F is the force, m is the mass of the car, and a is the acceleration of the car.The acceleration of the car can be calculated using the formula:a = (v^2 - u^2) / 2swhere v is the final velocity of the car, u is the initial velocity of the car, and s is the distance traveled by the car.Substituting the given values into the formula, we get:a = (0^2 - 27^2) / 2(578.0) = -0.27 m/s^2Substituting the given values into the formula for force, we get:F = 1100 kg * (-0.27 m/s^2) = -297 NThe negative sign indicates that the force is acting in the opposite direction to the motion of the car.Therefore, the average braking force acting on the car is -297 N, which is closest to choice A, -690 N.

A 1100 Kg Car Traveling at 27 M/s Starts to Decelerate