The decrease in the potential energy of a ball of mass $20 \,kg$ which falls from a height of $50 \,cm$ is ............ $\mathrm{J}$
The decrease in the potential energy of a ball of mass $20 \,kg$ which falls from a height of $50 \,cm$ is ............ $\mathrm{J}$
$968$
$98$
$1980$
None of these
The decrease in the potential energy of a ball of mass $20 \,kg$ which falls from a height of $50 \,cm$ is ............ $\mathrm{J}$
$\Delta U = mgh = 20 \times 9.8 \times 0.5 = 98\,J$
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