Sonic the Hedgehog and Tails the Fox can both run at about 343 meters per second -
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Sonic the Hedgehog and Tails the Fox can both run at about 343 meters per second - which, incidentally, is the speed of sound at sea level. Sonic has a mass of 35 kg, Tails has a mass of 20 kg. If they cach roll into a ball and then meet head-on in a perfectly elastic collision. what are their velocities after they collide?
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