The average speed is a scalar quantity. The average speed of the skier is 10 km/hrs.
It is calculated by dividing the total distance by the total time elapsed.
The
[tex]\overline{v}={\frac{\Delta x}{\Delta t}}[/tex]
Where,
[tex]\overline{v}[/tex] = average velocity
[tex]{\Delta x}[/tex] = displacement = 7.5 km
[tex]{\Delta t}[/tex] = change in time = 45 min = 0.75 hours
Put the values in the formula,
[tex]\overline{v}={\frac{7.5 }{0.75 }}\\\\\overline{v}= 10 \rm \ km/hrs[/tex]
Therefore, the average speed of the skier is 10 km/hrs.
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