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Question: 2.10
A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h-1. Finding
the market closed, he instantly turned and
walks back home with a speed of 7.5 km h-1. What is
the
(a) the magnitude of average velocity, and
(b) average speed of the man over the interval of
time
(i) 0 to 30 min, (ii)0 to 50 min, (iii) 0 to 40 min ?
[Note: You will appreciate from this exercise why it is better to define
average speed as total path length divided by time,
and not as
magnitude of average velocity. You would not like to
tell the tired man
on his return home that his average speed was
zero !]
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In this video, Chandan Sir walks through a step-by-step breakdown of NCERT EXERCISE 2.10 from the Class 11 Physics chapter on Motion in a Straight Line Class 11 Physics Chapter 2.
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