Two particles with the same mass m=1 g are moving in space (where there is no gravity) . The magnitude of their speeds are the same and equal to u=10 m/s. The directions of their motion makes angle alpha equals 60 to the power of o with each other. a) Find the angle between the velocity of the center of the mass of the two particles and the velocity of one of the two particles?

b) Suppose the two particles collide and stick together. Find the magnitude of the velocity with which the two particles move after they are stick together.

c) How much energy Q=? is lost in the collision?