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CBSE Class 9 Answered

a body goes from a to b with a velocity of 20ms and come back from b to a the average velocity of 30ms the average velocity of the body during the whole journey is
Asked by ayushyadav70303 | 12 Jul, 2022, 07:32: AM
Expert Answer
Let S be the distance between locations a and b .
 
Time t1 for onward journey = ( S / 20 )
 
Time t2 for return journey = ( S / 30 )
 
Total time ( t1 + t2 ) taken for onward and return journey.
 
Distance travelled = ( 2 S )
 
begin mathsize 14px style A v e r a g e space S p e e d space u space equals space fraction numerator D i s tan c e space over denominator t i m e space end fraction space equals space fraction numerator 2 space S over denominator begin display style S over 20 end style plus begin display style S over 30 end style end fraction space equals 24 space m divided by s end style
Answered by Thiyagarajan K | 12 Jul, 2022, 09:25: AM
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