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

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
The decrease in the potential energy of a ball of mass $20 \,kg$ which falls from a height of $50 \,cm$ is ............ $\mathrm{J}$
  • A
    $968$
  • ✓
    $98$
  • C
    $1980$
  • D
    None of these
✓

Answer

Correct option: B.
$98$
b
(b)$\Delta U = mgh = 20 \times 9.8 \times 0.5 = 98\,J$

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