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

A cyclist starts from the centre O of a circular park of radius 1 km. reaches the edge P of the park, then cycles along the circumference and returns to the centre along QO as shown in the figure.
IF the rounds trip takes ten minutes, the net displacement and average speed of the cyclist ( in metre and kilometre 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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