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Work, Energy, Power and Collision — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWork, Energy, Power and Collision1 Mark
MCQ
A ball is projected vertically down with an initial velocity from a height of $20 \mathrm{~m}$ onto a horizontal floor. During the impact it loses $50 \%$ of its energy and rebounds to the same height. The initial velocity of its projection is
  • ✓
    $20 \mathrm{~ms}^{-1}$
  • B
    $15 \mathrm{~ms}^{-1}$
  • C
    $10 \mathrm{~ms}^{-1}$
  • D
    $5 \mathrm{~ms}^{-1}$
✓

Answer

Correct option: A.
$20 \mathrm{~ms}^{-1}$

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