Question

A car moves on a circular path of radius 10 metre. It completes 5 revolutions in 5 minute. What is its average speed?

Answer 1

Radius = 10 m. Number of revolutions = 5. Time = 5 min = 5×60 seconds. The average speed of the car is 1 m/s.

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Answer 2

$\mathbf\red{Given:-}$

• $\tt{Radius \:of\: circular \:path}$
• $\tt{Number\:of\:revolutions}$
• $\tt{Time\:take}$

$\mathbf\blue{To\:Find}$

• $\tt{Average\:speed\:of\:the\:car}$

$\mathbf\green{Solution}$

$\tt{Total\:distance\:=\:\:Circumference\:of\:the\:circular\:path\times5}$

$\tt{Circumference\:of\:a\:circle = 2\pir\:r}$

$\tt{= 2\times\pi\times10= 20\pi}$

$\tt{Distance\:covered\:in\:5\: revolutions = 20\pi\times5 \\= 100\pi}$

$\tt{Total\:time = 5\:minutes \\ =5\times60 = 300sec}$

$\tt{Average\:Speed = \frac{Total\: Distance}{Total\:Time}}$

$\tt{= \frac{100\pi}{300}}$

$\tt{=\frac{\pi}{3} = \frac{22}{7\times3}}$

$\tt{= \frac{22}{21} = 1.047}$

$\tt{Therefore,\:Average\:Speed= 1.047}$

$\large\orange{\underline{{\boxed{\textbf{Be\:Brainly}}}}}$