Suppose you have mass of 1kg as you start to move it at a speed which is 90% of the speed of light then what will happen to that mass? Will it increase?
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2Yes and no. Depending on your definition of mass. There are two different schools of thought here. – lalala Dec 11 '19 at 08:48
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2Does this answer your question? Why is there a controversy on whether mass increases with speed? – rghome Dec 11 '19 at 08:53