The decrease in the potential energy of a ball of mass 20 kg whic… - Vidyadip

MCQ

The decrease in the potential energy of a ball of mass $20\ kg$ which falls from a height of $50\ cm$ is:

A
$968J$
✓
$98J$
C
$1980J$
D
None of these

✓

Answer

Correct option: B.

$98J$

Decrease in potential energy $\ce{\triangle U = mg(h_2−h_1)}$
$\ce{\triangle U = mgh} = 20 \times 9.8 \times 0.5 = 98J$

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