A proton is traveling to the right at 2.0E7 m/s. It has a head-on perfectly elastic collision with a carbon atom. The mass of the carbon atom is 12 times the mass of the proton. What are the speeds of each after the collision?(adsbygoogle = window.adsbygoogle || []).push({});

i was trying to tinker with the fact that the KE before and after the collision will be equal and so will be the momentum. but when i solve the equation i get 5773502 m/s but it doesn't work...i don't know how to even start this problem...

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Perfectly elastic collisions

**Physics Forums | Science Articles, Homework Help, Discussion**