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

Students will be able to

Q1:

The graph shows how the relativistic momentum of an object varies with speed. The 𝑥-axis shows the speed as 𝛽=𝑣𝑐 and the 𝑦-axis shows the momentum, 𝑝, divided by the speed of light, 𝑐. Use the formula 𝑚=𝑝𝑐×1𝛾𝛽 to find the rest mass of the object.

Q2:

An object is traveling at 75% of the speed of light in a frame 𝑆. The object has a rest mass of 2 kg. How much greater is the relativistic momentum of the object than the classical momentum of the object? Give your answer to 3 significant figures.

Q3:

At what speed is the relativistic momentum of an object equal to twice its classical momentum? Give your answer to 3 significant figures.

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