Question

Sarah bikes 15 miles in 70 minutes. Which is her average speed per minute?

Answer 1

0.21 `(mi)/min`

Explanation:

When calculating average velocity, the following formula is applicable:

`bar v=(Deltax)/(Deltat)`

Therefore,

`bar v=(Deltax)/(Deltat)`

`bar v=(15mi)/(20min)`

`bar v=0.21(mi)/(min)`

It should be noted that this equation is only applicable to average velocity. Instantaneous velocity can only be obtained by integrating the `a(t)` or taking the derivative of `x(t)`.