If the canister is shot directly at Earth, what is the ratio of its velocity, as measured on Earth, to the speed of light?   Part (b)  What about if it is shot directly away from the Earth (again, relative to c)?

Classical Dynamics of Particles and Systems
5th Edition
ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter14: Special Theory Of Relativity
Section: Chapter Questions
Problem 14.35P
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Suppose a spaceship heading directly away from the Earth at 0.85c can shoot a canister at 0.35c relative to the ship. Take the direction of motion towards Earth as positive.

Randomized Variablesv1 = 0.85 c
v2 = 0.35 c

Part (a)  If the canister is shot directly at Earth, what is the ratio of its velocity, as measured on Earth, to the speed of light

 Part (b)  What about if it is shot directly away from the Earth (again, relative to c)? 

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