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special relativity

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a man moving with a space craft is moving with a velocity near light's velocity.if his space craft's length is 100 m and mass is 200 kg then will he measure it 100 m and 200 kg?? and will a spectator on earth measure it less than 100 m and greater than 200 kg?? if yes then why??  what actually causes to decrease the length and increase the mass. these things are very confused to know. i want to know the reason why and how the length is decreased and mass is increased. please explain.
asked Oct 23, 2015 in General by horeg (260 points)

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