An Astronaut in a Rocket with a Speed V-0

An astronaut in a rocket with a speed v-0.6c relative to Earth performs a collision experiment and concludes that both momentum and energy are conserved.What would an Earth observer conclude?

A) Neither energy nor momentum is conserved.
B) The collision never happened because the two objects are never in the same place at the same time.
C) Energy is conserved,but momentum is not.
D) Momentum is conserved,but energy is not.
E) Both momentum and energy are conserved.

Correct Answer:

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