Question
Question: An athlete completes one round of a circular track of radius R in 40 second. What will be his displa...
An athlete completes one round of a circular track of radius R in 40 second. What will be his displacement at the end of 2 minute 20 second?
A
Zero
B
2R
C
2πR
D
7πR
Answer
2R
Explanation
Solution
2 min 20 second = 140 second
Q He complete one round in 40 sec, thus he will complete 3 round in 120 sec. and half round in 20 sec, thus his displacement is 2R.