[aruppcb]

1. A billiard ball moving at a speed of 2.2 m/s strikes an identical stationary ball a glancing blow.After the collision,one ball is found to be moving at a speed of 1.1 m/s in a direction making a 60° angle with the original line of motion.i) Find the velocity of other ball.ii) Can the collision be inelastic,given these data? Justify your answer.

[CWH68]

Hint: Use the law of conservation of momentum.

m1v*1 + m2v*2 before = m1v*1 + m2v*2 after.

Here, v* denotes the velocity vector, and v denotes the speed.

In an elastic collision, kinetic energy is conserved. i.e.

(m1v1^2)/2 + (m2v2^2)/2 before = (m1v1^2)/2 + (m2v2^2)/2 after.

In an inelastic collision, the total kinetic energy after is less than
the total kinetic energy after.

In a completely inelastic collision, the balls would stick together afterwards.

[CWH68]

In an inelastic collision, the total kinetic energy after is less than the total kinetic energy before the collision. My bad. Hope this helps.
-CWH :-)