The total amount of energy in the universe is

The zero-energy universe hypothesis proposes that the total amount of energy in the universe is exactly zero: its amount of positive energy in the form of matter is exactly canceled out by its negative energy in the form of gravity

Explanation:

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Constant.

Explanation:

The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics  states that energy is always conserved, it cannot be created or destroyed.

The zero-energy universe hypothesis proposes that the total amount of energy in the universe is exactly zero its amount of positive energy in the form of matter is exactly canceled out by its negative energy in the form of gravity.

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explanation:

the masses of the objects and the distance between them

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)