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I need to "Calculate the change in kinetic energy (that is, the kinetic energy after the collision minus the kinetic energy before the collision) for each marble."

So, I will start with the 25g marble going right, which hits the 10g marble and revserses direction to go left

I correctly found the velocity of the 25g marble after the collision, it is -.24.

Now, to find the change in kinetic energy, i did this:

v1=intial velocity

K2-K1=.5mv^2 - .5mv1^2

.5(.025)(-.24)^2 - .5(.025)(.25)^2

isn't this how one is supposed to find change in kinetic energy? Then why is it incorrect? did i go wrong with the positive negative sign?

this one should be negative right?

thankyou