science
Grade-7
Easy

Question

A boy is running along a circular path of radius R. He completes one revolution in 50 s. What is the displacement of the boy after 2 minutes 55 seconds?

  1. R
  2. 2R
  3. 3R
  4. R/2

hintHint:

Displacement is the shortest distance between two points.

The correct answer is: 2R


    • Total time = 2 min 55 sec = 175 sec
    • The boy completed one round in 50 sec
    • N o. space o f space r o u n d s space i n space 175 space s e c space equals space 175 over 50 space equals space 3.5 space r o u n d s space
 
    • After 3.5 rounds he will be on the opposite side. 
    • so, the displacement will be 2R. 

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