Question

Find the ratio of gravitational potential energy of height of an object is doubled and mass is tripled also find ratio of work done by gravity in bringing the object to zero height in both cases .​

Answer 1

Answer:

In physics, we usually talk about the difference in energy. This is done because in most cases, the difference in energy is more significant and easier to calculate. However, we can also assign an arbitrary value of energy to any particular point in the system, and thereby calculate the specific value of energy at any other point.

Let us assume, that the gravitational potential energy of all bodies on the surface of the earth to be 0.

Then, gravitational potential energy of 5kg mass placed at a height h = 0 + 5gh = 5gh

Also, gravitational potential energy of 15kg mass placed at a height h = 0 + 15gh = 15gh

Difference in energy = 15gh - 5gh = 10gh

That is, the 15kg mass has 10gh more gravitational potential energy than the 5kg mass.

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