The 500-m-long spaceship Springbrake is at rest on the planet ...

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The 500-m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500-m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would then be measured to be
 a. 180 m.
  b. 320 m.
  c. 500 m.
  d. 625 m.
  e. 781 m.

Question 2

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.

[parshano]

Answer to Question 1

d

Answer to Question 2

b

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TYSM

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Excellent