A projectile is fired from a canon at a velocity of 0.4c at an elevation angle of 30° to the X-axis. An observor is moving at a velocity of 0.1c relative to the canon along the X direction.
(a) At what angle does the observor measure the projectile to be fired?
(b) What is the projectile’s speed relative to the observor?
The Attempt at a Solution
Am I correct in thinking that I use the same method of Lorentz vector subtraction as shown near the bottom of the linked-to webpage below?
i.e. the section entitled, "What, therefore, would r & θ appear to be to an observor in relatively moving S'?"
Or does anyone suggest another (simpler?) method?