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Potential Energy

Calculate U...

Question

Calculate $U_{A} - U_{B}$

mgh

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-mgh

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2mgh

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Solution

The correct option is D -mgh
$U_{A} = m g h$ ; potential energy at the level A where $h = 0$ , So $U_{A} = 0$
$U_{B} = m g h$ ; Potential Energy at a level B where $h = h$ , So, $U_{B} = m g h$
$∴ U_{A} - U_{B} = - m g h$

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