Question
A body of mass of 100 Kg has gravitational potential energy of 2000 J. What will be its new gravitational potential energy if it moves at the height of 100 m?
- 98000J
- 9800J
- 980J
- 98J
Hint:
If the body has a mass of 100 Kg, PEG= 2000J, and height of 100 m, the new gravitational potential energy is 98000 J.
The correct answer is: 98000J
- The gravitational potential energy GPE= mgh
- The mass m= 100 Kg, PEG= 2000 J, h= 100m.
m = 100kJ
GPE = 2000J
h =100m
= 100 9.8 100
= 98000J
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The measurement of h above the ground is in meters.
A roller coaster is at the top of a 72 m hill and weighs 966 N. What is its gravitational potential energy?
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Gravitational potential is the effort required to move a unit test mass from infinity into the source mass's gravitational field. Both are held above the table, with one at the table. We can now state that the pencil that is higher than the table will have more gravitational potential energy.
¶The formula for Gravitational Potential Energy
⇒ GPE = m⋅g⋅h
where
m represents the mass in kilograms.
Gravitational acceleration, or g (9.8 on Earth)
The measurement of h above the ground is in meters.