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A cyclist starts from the centre 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 centre along OQ as shown in fig. If the round trip taken ten minute, the net displacement and average speed of the cyclist (in kilometer and kilometer per hour) is

A

0, 1

B

`(pi+4)/(2),0`

C

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

D

`0, 21.4`

Text Solution

Verified by Experts

The correct Answer is:
D
Net displacement = 0 and total distance = OP + PQ + QO
`=1+(2pixx1)/(4)+1=(14.28)/(4)km`
Averagespeed `= (14.28)/(4xx10//60)=(6xx14.28)/(4)=21.42 km//h`
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