- #1

uberinferno

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- 1

- Homework Statement
- Two balls weighing 2.5 kg and 5 kg are subject to an elastic collision. Before the collision, the first and lighter ball was at rest, and the second one was moving at a speed of 3.5 m / s. Determine the kinetic energy of the lighter ball after the collision.

Solution: Ek=27,22J

- Relevant Equations
- Ek= (mv^2)/2

mv1+mv2=mv1prim+mv2prim

I am guessing you have to find the speed at which the lighter ball moves and then to use the formula for kinetic energy, which I've tried but I'm not getting it quite right.

We got

m1=5kg v1=3,5kg

m2=2.5kg v2=0

v1prim=? v2prim=? Ek=?

How do you get the speed of the lighter ball after collision if you do not have the speed of the heavier ball given after collision? (in the statement)

We got

m1=5kg v1=3,5kg

m2=2.5kg v2=0

v1prim=? v2prim=? Ek=?

How do you get the speed of the lighter ball after collision if you do not have the speed of the heavier ball given after collision? (in the statement)

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