A runner starts a race at rest and reaches her top speed of 8.6m/s in 19.0s. What is the average acceleration?​

Average acceleration = 0.45 m/s²

Explanation:

Given the following data;

Initial velocity, u = 0m/s

Final velocity, v = 8.6 m/s

Time, t= 19 seconds

To find the average acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of final speed from the initial speed all over time.

Mathematically, acceleration is given by the formula;

Substituting into the formula, we have;

Acceleration = (8.6 - 0)/19

Acceleration = 8.6/19

Average acceleration = 0.45 m/s²

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human population grows worldwide