Lydia proposes to send an interstellar probe off in stages. The ...

[robinn137]

Lydia proposes to send an interstellar probe off in stages. The first stage, traveling radially outward at 0.500 c relative to Earth, will send off a second stage traveling in the same direction as the first stage at a speed of 0.500 c relative to the first stage. Finally, the second stage will send off a third stage traveling in the same direction at 0.500 c relative to the second stage. Relative to Earth, the speed of the third stage will have a magnitude of
 a. 0.500 c. b. 0.800 c. c. 0.929 c. d. 0.972 c. e. 1.500 c.

Question 2

Two spaceships traveling in opposite directions along parallel lines measure their own and the other spaceship's length while passing one another. The crew on spaceship A says that their ship is 1 000 m long and that ship B is 800 m long. The crew on ship B says that their ship is 1 000 m long and that ship A is 800 m long. At what speed does each crew say that the other ship is traveling relative to their own ship?
 a. 0.36 c
  b. 0.60 c
  c. 0.64 c
  d. 0.80 c
  e. 1.25 c

[aloop]

Answer to Question 1

C

Answer to Question 2

B

[robinn137]

Thanks for the timely response, appreciate it

[amandalm]

Excellent