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CBSE Class 11-science Answered

A man takes 40 seconds to complete one circle .radius of the circle is 10metre. Find the displacement after 20 seconds?  
Asked by Muhammedrafipp77 | 20 Jul, 2020, 07:41: AM
answered-by-expert Expert Answer
A man takes 40 seconds to complete one rotation of circle with radius 10 m
Displacment of man after 20 s is to be calculated. 
When t =20 s 
Number of rotation completed by man will be 
n = 20/40 =0.5 
This mean that he will be half way away from initial position. 

This means that if A is the initial position then he will reach at point B. 
The displacement is the minimum distance between initial and final position. 
In this case it will be equal to diamter of circle = 2r = 2 x 10 = 20 m 
Thus, after 20 s the displacment will be 20 m 
 
Answered by Shiwani Sawant | 20 Jul, 2020, 07:39: PM

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