A proton mass 167 x 1027kg is moving at 155 x 106ms, Ask an Expert

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A proton (mass 1.67 x 10^27kg) is moving at 1.55 x 10^6m/s directly toward a stationary helium nucleus (mass 6.64 x 10^27kg). After a head-on elastic collision, what is the proton's velocity? After a head-on elastic collision, what is the helium's velocity?

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