An athelete completes one round of a circular track of radius `R` in 40 seconds. What will be the displacement at the end of ` 2 min. 20 second ?

Question

An athelete completes one round of a circular track of radius `R` in 40 seconds. What will be the displacement at the end of ` 2 min. 20 second ?

An athelete completes one round of a circular track of radius `R` in 40 seconds. What will be the displacement at the end of ` 2 min. 20 second ?
A. zero
B. 2R
C. `2piR`
D. `7piR`

Monjur Alahi

9 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
t=2min 20 sec=120+20=140 sec.
after each complete rotation, displacement becomes zero.
Number of rotation `=(140)/(40)=3+(1)/(2)`
`therefore` displacement in `(1)/(2)` rotation=2R

9 views Answered 2023-02-05 15:29