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CBSE Class 11-science Answered

•A jogger runs in a straight line with

–an average velocity of 5 m/s for 4 min.

–an average velocity of 4 m/s for 3 min.

 

•What is the total displacement?

•What is the average velocity during this time?

Asked by bossyshiba | 01 Dec, 2021, 07:20: AM
Expert Answer
Displacement in 4 minutes with speed  5 m/s  =  speed × time = 5 m/s × 4 min × 60 s/min = 1200 m
 
Displacement in 3 minutes with speed  4 m/s  =  speed × time = 4 m/s × 3 min × 60 s/min = 720 m
 
Total displacement in 7 minutes = ( 1200 + 720 ) m = 1920 m
 
By assuming all displacements in straight line , we get average velocity as
 
Average velocity =  Net displacement / time  =  1920 m / ( 7 min × 60 s/min ) = 4.57 m/s
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