Momentum is a measure of A.how hard it is to stop an object.
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Answer:
About 8.3 minutes
Explanation:
Use the formula for velocity as the distance covered by the light divided the time it takes:
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Use the information about the speed of light in vacuum: 
and the information you are given regarding the distance between Sun and Earth: 
to solve the first velocity equation for the unknown time "t":

we can convert second into minutes by dividing by 60: 500 s = 500/60 minutes = 8.3333... minutes
Hello Alexandra, A pure metal is a substance that contains atoms of only one type of metallic element.
-Happy Studies
Changes in state of matter would be a physical change to whatever it is that you are changing so I think it would be B.Molecules because in order for something to change the molecules have to be moving apart from one another but I maybe wrong depending on what it is your looking at