A billiard ball moving at a speed of 6.6 ms–1 strikes an identical stationary ball a glancing blow. After the collision, one ball is found to be moving at a speed of 3.3, ms–1 in a direction making an angle of 60º with the original line of motion. The velocity of the other ball is
(A) 4.4 ms–1
(B) 6.6 ms–1
(C) 3.3 ms–1
(D) 5.7 ms–1
