Physics Help!?

[Unique7]

I have been trying to figure out these questions for a few days now, but I don't seem to be getting the correct answer!! Help on any of them would be great.. thanks.

1)A 0.320 kg green bead slides on a curved frictionless wire, starting from rest at point A in Figure P6.52. At point B the bead collides elastically with a 0.650 kg blue ball at rest. Find the maximum height the blue ball rises as it moves up the wire.

2)A 2.0 g particle moving at 5.4 m/s makes a perfectly elastic head-on collision with a resting 1.0 g object.
(a) Find the speed of each after the collision.
2.0 g particle ____
1.0 g particle ____
(b) Find the speed of each particle after the collision if the stationary particle has a mass of 10 g.
2.0 g particle ____m/s
1.0 g particle ____m/s
(c)Find the final kinetic energy of the incident 2.0 g particle in the situations described in (a) and (b).
KE in part (a) ____ J
KE in part (b) ____J