Description for speed

Explanation:

Speed is a physical quantity that describes the rate of change of distance with time.

Distance is the length of the path covered by a body.

Time is the duration of the motion of the body

                              Speed =

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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