Question

A CAR
runs at constant speed on a circular track
of radius 10 m taking 6.28s on each lap(i.e. round).
The average speed and average velocity for each
complete lap is :
(1) Velocity 10 m/s, speed 10 m/s
(2) Velocity zero, speed 10 m/s
(3) Velocity zero, speed zero
(4) Velocity 10 m/s speed zero
​

Answer 1

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The average velocity is defined by the ratio of displacement to time.

Since, after one complete lap the car returns to it's original position, the displacement is zero and therefore , average velocity is zero.

Now, average speed is , by definition , length of actual path divided by time.

If R is radius of circular path, the path length is (2)(pi)(R), the circumference of the circle.

So, average speed is (2)(pi)R/t =(2)(3.14)(10)/6.28= 10m/s.

Answer 2

Answer:

Option (2)

Explanation:

In a circular track, speed is 10m/s but velocity is 0 as velocity depends on displacement and displacement is 0 in this case...

hope it helps..

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