A fast-moving particle travels through the air at a speed of

PHYSICS · Subjective · A Level · Physics · Turning points in physics · Turning points in physics

Problem

A fast-moving particle travels through the air at a speed of 0.85c0.85c. Kenny, standing on the surface of the Earth, sees the particle travel a distance of 12.5 km. How far does the particle travel in its own frame of reference?

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