53. The position (x)-time (t) graph for a particle moving
along a straight line is shown in figure. The average
speed of particle in time interval t = 0 to t = 8 s is
(2) 5 m/s
(1) Zero
(3) 7.5 m/s
(4) 9.7 m/s
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Answer: (2) 5M/S
Explanation: average speed is v =
total time
total distance
total distance is 40m and total time is 8sec
v=
8
40
=5ms
−1
hence the B option is correct
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