Question

A car of mass 833 kg is traveling 22.4 m/s when the driver applies the brakes, which lock the wheels. The car skids for 4.67 s in the positive x-direction before coming to rest. What is the car's acceleration?

A) 5.12 m/s²
B) 4.80 m/s²
C) 4.81 m/s²
D) 5.01 m/s²

Answer 1

The car's acceleration is -4.80 m/s².

Step-by-step explanation:

To calculate the car's acceleration, we can use the equation:

acceleration = (final velocity - initial velocity) / time

In this case, the final velocity is 0 m/s (since the car comes to rest), the initial velocity is 22.4 m/s, and the time is 4.67 s. Plugging these values into the equation, we get:

acceleration = (0 - 22.4) / 4.67 = -4.80 m/s²

Therefore, the correct answer is B) 4.80 m/s².