Posted by taylor on .
a 10.0g marble rolls to the left with a velocity of magnitude 0.400 m.s^1 on a smooth, level surface and makes a headon collision with a larger 30.0g marble rolling to right with a velocity of magnitude 0.100 m.s^1. If the collision is perfectly elastic,find the velocity of each marble after the collision.( since the collision is headon, all the motion os along a line.)

physics please help 
Elena,
v1 – to the left,
v2 – to the right
u1=[(m1m2) •v1 – 2• m2•v2]/(m1+m2) =
=[(1030) •0.4  2•30•0.1]/(10+30) =  0.35 m/s.
u2 = [2•m1•v1 –(m2m1) •v2]/(m1+m2) =
= [2•10•0.4 –(3010) •0.1]/(10+30) =0.15 m/s.
u1 – to the right,
u2 – to the left.