Calculate Kinetic Energy in Elastic and Non-Elastic Collisions

[EPhoenix]

NONElastic Collision

Homework Statement

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

Homework Equations

Ek= (m1 * u1 ^2) / 2

m1u1 + m2u2 = m1v1 + m2v2

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

 

[tomwilliam]

Homework Statement

How much of kinetic energy has been transformed into heat

If the collision is elastic, as you say in the title, you don't need any more data to answer this question.

 

[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...

 

[EPhoenix]

Here... I will edit it...

 

[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!

 

[EPhoenix]

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

Any more thoughts?