Sonic, a hedgehog of quite extraordinary talents, is zooming through interstella

Question

Sonic, a hedgehog of quite extraordinary talents, is zooming through interstellar space at a speed of 50% the speed of light in search of the last Chaos Emerald. His speed is mea- sured by Tails the fox, who watches from a nearby planet. Just as he is about to reach the Emerald, he sees his evil nemesis, Dr. Robotnik, approaching him head-on. Dr. Robotnik’s speed is measured by Tails to be 75% the speed of light.

According to Newtonian (pre-Einstein) physics, how fast is Dr. Robotnik closing in on Sonic according to Sonic? Do you think this result is very accurate, given the laws of special relativity?

Explanation / Answer

-20% or +20% depending on which ones perspective you are looking at in relation to the other.

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