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Question: Answered & Verified by Expert
A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement $\mathrm{x}$ is proportional to
PhysicsWork Power EnergyJEE MainJEE Main 2004
Options:
  • A
    $x^3$
  • B
    $e^x$
  • C
    $x$
  • D
    $\log _e x$
Solution:
2655 Upvotes Verified Answer
The correct answer is:
$x^3$
$\mathrm{K}_{\mathrm{f}}-\mathrm{K}_{\mathrm{i}}=\frac{\mathrm{mk}}{2} \mathrm{x}^2$
$\mathrm{~K}_{\mathrm{f}}-\mathrm{K}_{\mathrm{i}} \propto \mathrm{x}^2$

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