A cyclist starts from the center O of a circular park of radius one kilometer, reaches the edge P of the park, then cycles along the circumference and returns to the center along QO as shown in the figure. If the round trip takes ten minute, the net displacement and average speed of the cyclist (in meter and kilometer per hour) is –
A
0, 1
B
, 0
C
21.4, 
D
0, 21.4
Text Solution
Verified by ExpertsThe correct answer is:
D
Cyclist returns at initial point
∴ Displacement = 0
v av = 
= 6R (2 + π /2)
= 21.4 km
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