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?
- R
- 2R
- 3R
- R/2
Hint:
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
- After 3.5 rounds he will be on the opposite side.
- so, the displacement will be 2R.
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