Question

If a car accelerates from 81 m/s to 61 m/s in 5 seconds, what is the car's average acceleration?

Answer 1

The car's average acceleration is -4 m/s²

Step-by-step explanation:

To find the average acceleration, we can use the formula:

average acceleration = change in velocity / time taken

Given that the car accelerates from 81 m/s to 61 m/s in 5 seconds, the change in velocity is:

change in velocity = final velocity - initial velocity = 61 m/s - 81 m/s = -20 m/s

Plugging in the values into the formula, we get:

average acceleration = -20 m/s / 5 s = -4 m/s²