Two protons move at speed v, one along the x axis and one along the y axis. what is the relative speed of the two protons? evaluate your answer for the special case v = 3/5 c.

0.85 c

Explanation:

When the two travel at right angles to each other , their relative velocity is given by the hypotenuse formed by the x and y direction velocities.

Relative velocity of the two protons is  given as

If v = 3/5 c , then the relative speed = (3/5c) =0.85 c

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