JEE Main Physics question
Which of the following graphs cannot possibly represent one dimensional motion of a particle [AMU (Med.) 2010] (I) Total distance covered vs time, with a segment where it decreases; (II) Position vs time forming a closed loop; (III) Velocity vs time forming a full circle; (IV) Speed vs time, dipping below the axis into negative values
Answer: (D)
Solution
(I) Total distance covered can never decrease with time, so a graph with a downward segment is impossible. (II) A closed loop in the position-time plane would require two different positions at the same instant — impossible. (III) A full circle in the velocity-time plane
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