Question

A race car is moving with a velocity of 144 kilometers/hour. The driver applies the brakes, and the car comes to a halt in 12.0 seconds. What is the average acceleration of the car during those 12.0 seconds?

Answer 1

Answer:

To answer, first, convert the given velocity in km/h to m/s as shown below,

                       (144 km / hr) x (1000 m / 1 km) x (1 hr / 3600 s) = 40 m/s

The acceleration (a) is solved by through the equation,

                                    a = (Vf - Vi) / Δt

where Vf and Vi are final and initial velocities, respectively and Δt is change in time. Substituting the known values,

                                    a = (0 - 40 m/s) / 12 s = -3.3 m/s²

Thus, the answer to this item is letter B.

Explanation:

Answer 2

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