Two Balls of masses

mA = 45 grams and mB = 65 grams
are suspended as follows: both Balls are hanging by a 30 cm string and are vertically parallel to each other. The lighter ball is pulled away to a 66 degree angle with the vertical and is released, hitting the larger mass.

a) What is the velocity of the lighter ball before impact?

b) What is the velocity of each ball after the elastic collision?

c) What will be the maximum height of each ball after the elastic collision?