A Spaceship Leaves Earth and Maintains a Constant Force by Means

Multiple Choice

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.