Question

An athelete complete one round of a circle of a diameter in49m in 20 sec. Calculate distance and displacement at the end of 30s

Answer 1

Hi.

Here is the answer---

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Given ⇒

Diameter of the Circle = 49 m.

Circumference of the Circle = 2 × 22/7 × 49/2
                                            = 154 m.


∴ In 20 seconds, Distance covered by the Body is 154 m.
   In 1 Seconds,---------------------------------------------154/20 m.
  ∴ In 30 Seconds---------------------------------------- 77 × 3 m
                                                                            = 231 m.

∴ Distance Covered by the Body is 231 m.


For Displacement ⇒ 
Displacement covered in 20 seconds = 0

Now, Displacement covered in 10 seconds = 154/10
                                                                     = 15.4 m.


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Hope it helps.