Well I noticed something with a helium balloon which a little weight was tied to its rope to avoid it flying away. When the weight is on the ground and the rope is taut, I pulled it down a little and let it go. It flew up and when the rope was taut again, it kept on going higher with a negative acceleration, traveled some height and then stopped and fell down again. Then I pulled it down much more than the last time, expecting it to gain a greater velocity due to buoyancy which is bigger than its weight, when the rope becomes taut, and travel a longer height, but what happened was it traveled a much smaller distance. Any explanation??

  • $\begingroup$ The rope weights $\endgroup$ – Alchimista Jan 30 '18 at 10:22
  • $\begingroup$ @Alchimista I think the weight of the rope is negligible. And it is also present in the first case, why not effecting that? $\endgroup$ – Matin N. Jan 30 '18 at 10:28
  • $\begingroup$ It is like a spring. Your other observation seems weird $\endgroup$ – QuIcKmAtHs Jan 30 '18 at 11:05
  • $\begingroup$ You say that, "when the rope was taut again, it kept on going higher with a negative acceleration […]" Can I just check that the rope is now raising the weight, having lifted it off the ground? $\endgroup$ – Philip Wood Jan 30 '18 at 11:34
  • $\begingroup$ Yes, the rope has lifted the weight, and in the first case the rope lifts it higher than the second. $\endgroup$ – Matin N. Jan 30 '18 at 12:23

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