Question

A world-class runner can reach a top-speed of 11 ms⁻¹ in the first 15m of a race. Calculate the average acceleration of the runner. ​a. 0.73 ms⁻²

b. 0.47 ms⁻²
c. 0.93 ms⁻²
d. 0.63 ms⁻²

Answer 1

The average acceleration of the runner is 0.73 ms⁻².

Step-by-step explanation:

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

average acceleration = change in velocity / time taken

Initially, the runner starts from rest, so the change in velocity is equal to the final velocity. The time taken is 15m / 11 ms-1. Plugging in these values into the formula, we get:

average acceleration = 11 ms-1 / (15m / 11 ms-1) = (112 ms-2) / 15m = 0.73 ms-2

Therefore, the average acceleration of the runner is 0.73 ms-2.