A cyclist goes once around a circular track of diameter 105 metre in 5 minutes. Calculate his speed.

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7. MOTION

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A cyclist goes once around a circular track of diameter $105$ metre in $5$ minutes. Calculate his speed.

Option A

Option B

Option C

Option D

Solution

Given $D=105 m , R =\frac{105}{2}=52.5 m$

$t=5 \times 60=300 s$

Now, speed $=\frac{\text { distance }}{\text { time }}=\frac{2 \times 3.14 \times 52.5}{300}$

$=1.1 m s ^{-1}$

Standard 9

Science

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