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5.work,energy,power and collision — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
Consider a rubber ball freely falling from a height $h = 4.9\, m$ on a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Which one of the following graph represents the velocity as a function of time and the height as a function of time ?
  • A

  • B

  • ✓

  • D

✓

Answer

Correct option: C.

c
$h=\frac{1}{2} g t^{2} v=-g t$ and after the collision, $v=g t$

(parabolic)(straight line)

Collision is perfectly elastic then ball reaches to same height again with same velocity.

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