Question

A bicycle racer rides from a starting marker to a turnaround marker at 10 m/s. She then rides back along the same route from the turnaround marker to the starting marker at 25 m/s. What is her average speed for the whole race?

Answer 1

Given :

A bicycle racer rides from a starting marker to a turnaround marker at 10 m/s.

She then rides back along the same route from the turnaround marker to the starting marker at 25 m/s.

To Find :

Her average speed for the whole race.

Solution :

We know, average velocity is given by :

`Average \ Velocity = (v_1 + v_2)/(2)\\\\Average\ Velocity = (10 + 25)/(2)\\\\Average \ Velocity = (35)/(2)\\\\Average \ Velocity = 17.5 \ m/s`

Therefore, average speed for the whole race is given by 17.5 m/s.