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physics - special relativity

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When a rocket is moving at a constant speed, it has a relativistic mass that is 60 percent greater than its rest mass.

Find the speed of the rocket.

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So far, I tried using the relativistic mass equation..

0.6m = mv / square root 1-(v/c)2

  • physics - special relativity -

    what did you get when you used that formula??

  • physics - special relativity -

    whoops..
    wrote it wrong.. should be..

    0.6m = (mv) / (square root 1 - (v/c)^2)

    and that's as far as i got.. i don't know what to do from there or if it's the right equation :S

  • physics - special relativity -

    The relativistic mass is 1.6 times the rest mass. The rest mass cancels out.

    1.6 = 1/sqrt[1 - (v/c)^2]
    sqrt[1 - (v/c)^2] = 5/8
    1 - (v/c)^2 = (5/8)^2 = 25/64
    (v/c)^2 = 39/64
    v/c = 0.781

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