A box has a mass of 5.8 kg. The box is lifted from the garage floor and placed on a shelf. If the box gains 145 J of potential energy, how high is the shelf?
[Assume $g = 10 m / s^{2}$ ]

2.5 m

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1.5 m

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3.5 m

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14.5 m

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Solution

The correct option is A 2.5 m
If $h$ be the required height , the potential energy $P E = m g h$
or $h = P E / m g = \frac{145}{5.8 \times 10} = 2.5 m$

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A box has a mass of 5.8 kg. The box is lifted from the garage floor and placed on a shelf. If the box gains 145 J of potential energy, how high is the shelf?[Assume g=10m/s2]

The correct option is A 2.5 mIf h be the required height , the potential energy PE=mghor h=PE/mg=1455.8×10=2.5m

A box has a mass of 5.8 kg. The box is lifted from the garage floor and placed on a shelf. If the box gains 145 J of potential energy, how high is the shelf?
[Assume $g = 10 m / s^{2}$ ]

The correct option is A 2.5 m
If $h$ be the required height , the potential energy $P E = m g h$
or $h = P E / m g = \frac{145}{5.8 \times 10} = 2.5 m$