A 64 kilogram person is ice-skating due north with a velocity of 6.3 m/s when he collides with a 43 kilogram boy. The person and boy stay together and have a velocity of 3.4 m/s at an angle of 39 degree north of due east immediately after the collision. Determine
(a) the magnitude and
(b) the direction (as an angle measured from due East) of the boy velocity just before the collision?