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CBSE Class 11-science Answered

a train travels from one station to another station at the speed of 40km/h and returnes at a speed of 60km/h. calculate the average speed and average velocity
Asked by layamariam2004 | 18 Nov, 2020, 07:49: AM
answered-by-expert Expert Answer
Average speed = distance / time 
 
Let d be the distance between one staion and another station.
 
If t1 is time taken for onward journey = distance /speed = (d/40) hr
 
If t2 is time taken for return journey = distance/speed = (d/60) hr 
 
average speed = total distance / time
 begin mathsize 14px style a v e a r g e space s p e e d space equals space fraction numerator 2 d over denominator begin display style d over 40 end style plus begin display style d over 60 end style end fraction space equals space 240 over 5 space k m divided by h r space equals space 48 space k m divided by h r end style
--------------------------------
 
average velocity = displacement / time 
 
since train returned to starting point , displacement = 0 
 
hence average velocity = 0
Answered by Thiyagarajan K | 18 Nov, 2020, 10:41: AM
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