(3) 40 III
5. A body moving along a straight line covers a
distance in three parts 3 m, 6 m and 12 m
respectively with speed 7 m/s. Average speed of
the body and time taken in complete journey is
Answers
Answered by
1
Explanation:
total distance=21m
total time= t
7=21/t
so, t=3sec
Answered by
0
Let the total distance be 3x.
The time required are x/2 , x/3 and x/4 respectively .
Avg speed = total distance/total time
= 3x/x/2+x/3+x/4
=3x/13x/12
=36/13 m/s
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