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Starting to forget my physics: silly energy question

  • #1
if two equal masses with equal speed are traveling towards eachother, do they have 0 total energy, or twice the energy of one mass?
I know they will have 0 total momemtum, but I can't remeber if adding their energy is a vector thing or not.
 

Answers and Replies

  • #2
Pengwuino
Gold Member
4,989
15
Its not a vector problem and how can they have 0 momentum if they are both in motion.
 
  • #3
2,209
1
If they are considered as a system then the system has zero net momentum. Each individual component has its own momentum vector according to its path. Their kinetic energy is the sum of the kinetic energies of each piece, KE is a scalar and not a vector.
 
  • #4
ok, thats what i was thinking but wasn't positive.
thanks
 

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