Question

A cyclist completes 2 revolution of a circular path of diameter of 20m in half minute.calculate the speed of cyclist? plz answer

Answer 1

Answer:

The total distance travelled = 1/2×2 πr

= πr

= 3.14×120

= 376.8

Total speed = Total distance ÷ Total Time.

= 376.8 ÷ 120

= 3.14 m/s.

Answer 2

Given that, a cyclist completes 2 revolutions of a circular path of diameter of 20 m in half minutes.

We have to find the speed of the cyclist.

Distance covered by cyclist = Circumference of circle

And circumference of circle = 2πr

Radius = Diameter/2 = 20/2 = 10 m

So,

Distance covered by cyclist = 2 × 3.14 × 10 = 62.8 m

Similarly, Distance covered by cyclist in 2 complete revolutions = 1/2 × 62.8 = 31.4 m

Now, we have distance = 31.4 m and time = 30 sec

Speed = Distance/Time

= 31.4/30

= 1.05 m/s

Therefore, the speed of the cyclist is 1.05 m/s.