# Elastic Collision

1. Feb 9, 2010

### EPhoenix

NONElastic Collision

1. The problem statement, all variables and given/known data

One sphere collides with other sphere that has speed of u2 = 0... Both spheres have same mass (m1 = m2 = 0.3 kg)... After collision first sphere has speed of v1 = 0.6 m/s, second sphere v2 = 1.1 m/s ... How much of kinetic energy has been transformed into heat

2. Relevant equations

Ek= (m1 * u1 ^2) / 2

m1u1 + m2u2 = m1v1 + m2v2

3. The attempt at a solution

from second formula i got u1 = 1.7 m/s

and after doing Ek = Ek1 + Ek2 + heat,

heat = Ek - Ek1 + Ek2
heat = 0.2 J

Can anybody confirm this...7

Last edited: Feb 9, 2010
2. Feb 9, 2010

3. Feb 9, 2010

### EPhoenix

yeah i know... elastic collision do not transfer heat and stuff...

so it will be 0

BUT proffesor told my GF (she took that exam) that there is solution and it's not 0

dunno how, but I guess then he meant nonelastic but wrote elastic......

4. Feb 9, 2010

### EPhoenix

Here... I will edit it...

5. Feb 9, 2010

### tomwilliam

Well if the collision is inelastic, I get the same answer as you do, to 2 sig fig. As long as it isn't a trick question!

6. Feb 9, 2010

### EPhoenix

If it was for me, i wouldn't ask here... but this is girls be or not be exam...

Any more thoughts?