A) 8 m/min
B) 6 m/min
C) \[\frac{8}{3}\] m/min
D) 2 m/min
Correct Answer: D
Solution :
Key Idea : The average velocity is defined as total displacement of the body in a particular time interval divided by the time interval. Displacement from 0 to 5 s = 40 m Displacement from 5 to 10 s = 40 m Displacement from 0 to 15 s = - 20m and displacement from 15 to 20 s = 0 m \[\therefore \] Net displacement = 40 + 40 - 20 + 0 = 60m Total time taken = 5 + 5 + 15 + 5 = 30 min Hence, average velocity \[=\frac{displacement\text{ (}m)}{time\,\,(\min )}\]
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