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   A ball of mass m1=0.250 kg and velocity v1=5.00 m/s [E] collides head-on with a...

   A ball of mass m1=0.250 kg and velocity v1=5.00 m/s [E] collides head-on with a ball of mass m2=0.800 kg that is initially at rest. No external forces act on the balls.
a. Show what is conserved through the appropriate formula if the collision is elastic.

b. What are the velocities of the balls after the collision?

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