Question

A spaceship launched from a space-station was moving with speed 0.6c , with respect to the spacestation , in a direction perpendicular to its motion , when a band of asteroids is observed ahead of the ship . A proton gun is shut by the spaceship with speed of 0.99c , in order to destroy it . what speed will the observer in the spacestation measure for these protons ?

Answer 1

relative motion
the spaceship is moving with velocity 0.6c and it shoots thte proton gun with velocity 0.99c with respect to itself
so the velocity as seen from the spacestation will be 0.6c+0.99c=1.59c
we can write it in the form of the folling equation
v of proton gun wrt spacestation= v of proton wrt spaceship + v spaceship wrt spacestation

Answer 2

that's wrong :/ we are talking here about relativistic kinematics , where speeds are relative to each other by lorentz transformations V'x=Vx-V/1-(VxV/C^2) ... the answer you gave exceeded speed of light which is wrong .. in contrary to the first postulate of Einstein.

Answer 3

you're right sorry man

Answer 4

and thanks for the correction

Answer 5

don't worry