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A meterstick in a passing spaceship has a length of 0.990m. what is the speed of...

A meterstick in a passing spaceship has a length of 0.990m. what is the speed of the spaceship. Express your answer in terms of the speed of light c. v=____*c

and

What is the relativistic energy of a 1.0-kg mass moving with a speed of 0.65c? .75c? Please make sure this is the correct answer. I will upvote immediately.

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