A spaceship leaves Earth and maintains a constant force by means of a nuclear engine. As the speed of the spaceship increases, an observer on Earth finds that relative to her the magnitude of the spaceship's acceleration is
a. 0.
b. decreasing.
c. constant.
d. increasing.
e. proportional to the kinetic energy of the spaceship.
Question 2
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5 c and a spaceship moves toward it (to the west) at a speed of 0.8 c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7 c
b. 0.21 c
c. -0.21 c
d. 0.93 c
e. -0.93 c
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