Question
A car runs at aconstant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively is
-
0, 0
-
0, 10 m/s
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10 m/s, 10m/s
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10 m/s, 0
Solution
B.
0, 10 m/s
In completing a circular lap, car's displacement is zero.
Average velocity is defined as the ratio of displacement to time taken while the average displacement to time taken while the average speed of a particle in a given interval of time is defined as the ratio of distance travelled to the time taken.
On a circular path in completing one turn, the distance travelled is 
while displacement is zero.
Hence, average velocity = 
