Question

31. 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
(1) 3 m/s, 7 s
(2) 6 m/s, 10 s
(3) 7 m/s, 3 s
(4) 4 m/s, 4 s
morticle moving Y38.​

Answer 1

Answer:

it is non uniform motion

Answer 2

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Answer: 36/13

Explanation: 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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