An Astronaut in a Rocket Moving with a Speed V

An astronaut in a rocket moving with a speed v = 0.6c relative to Earth performs a collision experiment with two small steel balls and concludes the both momentum and energy are conserved. What would an Earth observer conclude?

A) Only momentum is conserved.
B) Only energy is conserved.
C) Neither energy nor momentum is conserved.
D) Both energy and momentum are conserved.
E) The collision never happened because the two balls are never in the same place at the same time.

Correct Answer:

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