physics  special relativity
posted by CL on .
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

what did you get when you used that formula??

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 
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