Question

An ant is travelling in a circle of radius 21 m with a speed of

11m/s. Its motion is a uniform circular motion. Find the time

taken to cover half a road.​

Answer 1

Answer:

Correct option is

B

10/πms

−2

As the average acceleration is change in velocity over the time taken,

In this case when the half revolution is over the direction in the speed changes by 180 degrees,

so the change in velocity =5−(−5)=10 m/s

The time taken to cover this distance =

5

π∗r

=

5

5π

=π (as the distance travelled is semicircle)

So, average acceleration =

π

10

ms

−2