Question

A cross-country skier can complete a 7. 5 km race in 45 min. What is the skier’s average speed? km/h.

Answer 1

The average speed is a scalar quantity. The average speed of the skier is 10 km/hrs.

What is the average speed?

It is calculated by dividing the total distance by the total time elapsed.

The

$\overline{v}={\frac{\Delta x}{\Delta t}}$

Where,

$\overline{v}$ = average velocity

${\Delta x}$ = displacement = 7.5 km

${\Delta t}$ = change in time = 45  min = 0.75 hours

Put the values in the formula,

$\overline{v}={\frac{7.5 }{0.75 }}\\\\\overline{v}= 10 \rm \ km/hrs$

Therefore, the average speed of the skier is 10 km/hrs.

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