In this lesson, we will learn how to calculate the total relativistic energy of massive objects moving relative to an observer.

Q1:

A metal cube with a rest mass of 2 kg moves at a speed of 0.1𝑐 in frame 𝑆. What is its total relativistic energy in frame 𝑆? Give your answer to 3 significant figures.

Q2:

A spaceship moves at a speed 𝑣 in frame 𝑆. Its mass in frame 𝑆 is measured to be 20,000 metric tons. What is its total relativistic energy?

Q3:

The graph shows the total relativistic energy, 𝐸, of an object against its speed, 𝑣. The speed of light, 𝑐, is defined to be 1. What is the rest mass of the object?

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