Set the speed of departure from Problem 2 equal to the speed of approach from Problem 1. Solving this relation for the final speed, vf, yields:
A. vf = v + u
B. vf = vi− u
C. vf = vi + 2u
D. vf = vi − 2u
Problem 1
From the perspective of an observer on the planet, what is the spacecraft’s speed of approach?
A. v1+u
B. v1− u
C. u − vi
D. vf −u
Problem 2
From the perspective of an observer on the planet, what is the spacecraft’s speed of departure?
A. v1+u
B. vf− u
C. u − vf
D. vi − u
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