Question about relativistic motion

[M_Saeed]

I have this question .

There are two bodies in space . Each are moving with a speed of C/2 towards each other . What is the relative speed of one body with respect to the other .

According to classical view it has to be C but in real it doesnt can any1 tell me how to find the answer .:rolleyes:

[Dick]

Just use the relativistic formula for velocity addition. http://en.wikipedia.org/wiki/Velocity-addition_formula

[Domnu]

u' = (u1 + v1)/(1 - u1*v1/c^2) where u1, v1 are velocities... this reduces to u' = u1 + v1 classically. substitute u1 = c/2, u2 = c/2, etc. and you have your answer.