1) A billiard ball of mass M, moving with velocity $v_{1}$ collides with another ball of the same mass but at rest. If the collision is elastic, the angle of divergence after the collision is A) $0^{0}$ B) $30^{0}$ C) $90^{0}$ D) $45^{0}$ Answer: Option AExplanation:When billiard ball collide elastically, they will exchange the kinetic energy, so they may move in a straight path or at any angle
