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A cyclist starts from the center O of a ...

A cyclist starts from the center O of a circular park of radius 1km, reaches the edge P of the park, then cycles along the PQ circumference and returns to the center along OQ as shown in fig. If the round trip taken ten minute, the (a) net displacement, (b) average velocity and (c) average speed of the cyclists (in kilometer per hour) is

A

0, 1

B

`(pi+4)/(2), 4`

C

`21.4,(pi+4)/(2)`

D

`0,21.4`

Text Solution

Verified by Experts

The correct Answer is:
D
Average speed = `((2R+piR//2)km)/((1//6)h)`
`=(12R+3piR)kmh^(-1)=(12+3pi)(km)/(h)" (as R = 1 km)"`
`="21.4 kmh"^(-1)`
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