Physics
A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding ?

1 metre
3 metres
2 metres
4 metres

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Physics
Conservation of energy refers to the fact that

If you conserve energy you will not be as tired
The entropy of the universe is always increasing
Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient

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