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Class 10 Class 12
A cyclist starts from the centre O of a circular track of radius 1 km, reaches the edge A of the track and then cycles along the circumference and stops at point B. If the total time taken is 10 minutes, what is the a) average velocity b) average speed of the cyclist.

a) Displacement in 10 min (=1/6 hr) = OB = r = 1 km

Therefore,

Average velocity =
b) Distance travelled in 1/6 hr = 0 to A (along radius)  + A to B (along the arc)

= r +

= 1 km + 1 km +

= 2.05 km

Therefore,

Averge speed =  = 12.30 km/hr

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