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A 1 kg object is initially 20m above the ground and rises to a height of 40m. Liz and Connor each measure its position, but each of them uses a different coordinate system. Select the choice that best represent the Δ P E as measured by the two scientists. Where we define Δ P E = P E f i n a l − P E i n i t i a l . Assume g = 10 m / s 2 .

Respuesta :

Answer:

The change in potential energy of the object is 200 Joules.

Explanation:

Mass of the object, m = 1 kg

Initial height of the object, [tex]h_i=20\ m[/tex]

Final height of the object, [tex]h_f=40\ m[/tex]

Liz and Connor each measure its position, but each of them uses a different coordinate system. The change in potential energy is equal to the difference in final and initial potential energies such that :

[tex]\Delta PE=PE_{final}-PE_{initial}[/tex]

[tex]\Delta PE=mgh_{f}-mgh_{i}[/tex]

[tex]\Delta PE=mg(h_{f}-h_{i})[/tex]

[tex]\Delta PE=1\times 10(40-20)[/tex]

[tex]\Delta PE=200\ J[/tex]

So, the change in potential energy of the object is 200 Joules.

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