Question

an athlete complete one rounds of a circular track of diameter 40m in 12 sec . what will be the distance covered and the displacement at the end of 54 sec​

Answer 1

Answer:

The athlete covers one round of the circular track in 12 seconds.

So, the diameter is 40 m

Now,

Distance covered in 12 seconds = 1 complete round = circumference of the circle

Now,

In 6 seconds it will cover half round.

Now,

After 54 seconds

54 seconds = 48 sec + 6 sec

54 seconds = 4*12 sec +6 sec

So, 54 seconds = 4 complete round + 1 half round.

Now,

Displacement will be along the diameter

So, displacement = 40 m

Distance covered = 4*circumference +circumference /2

Now

Circumference = 2 pie r

Now,

Distance covered =

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