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Please help me!! it's for extra credit and I need it!!!!

Suppose an 85 kg sky diver is falling toward the Earth. when the skydiver is 25 m above the Earth, he is moving 55m/s. at this point, calculate the sky divers gravitational potential energy.

about 46,000 J
about 21,000 J
about 128,600J
about 116,900J

Respuesta :

skyluke89

Answer: about 21,000 J

Explanation:

The skydiver gravitational potential energy is given by

[tex]U=mgh[/tex]

where

m = 85 kg is the mass of the skydiver

g = 9.81 m/s^2 is the gravitational acceleration

h = 25 m is the height above the ground

Substituting the numbers inside the formula, we find

[tex]U=(85 kg)(9.81 m/s^2)(25 m)=20,846 J[/tex]

which is approximately 21,000 J.

euden57

Answer:

The answer is B. 21,000J

Step by step Explanation:

1) The gravitational potential energy is the potential energy that depends on the height associated with the gravitational force. This will depend on the relative height of an object at some reference point, the mass and the acceleration of gravity.

2) The gravitational potential energy is expressed by the formula PE = mgh where (PE) represents the potencial energy, (m) represents the mass, (g) represents gravity and (h) represents height.

3) knowing this we can proceed to replace the values given in the problem.

PE = (85Kg)(9.8m/s)(25m)

PE = 20,825J

20,825 approaches 21,000.

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