While traveling along a highway, a driver slows from 24 m/s to 15 m/s in 12 seconds. What is the automobile’s acceleration? (Remember that a negative value indicates a slowing down or deceleration.)

Explanation:

Given: A driver slows from to in seconds.

To find: The acceleration of the automobile.

Solution: We have,

Initial velocity, .

Final velocity, .

Time, seconds.

We know that acceleration,

.

Hence, the acceleration of the automobile is . The automobile is slowing down with an acceleration of  .

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