A ball moving with a speed of 9 m/s strikes an identical stationary ball such that after collision the direction of motion of each ball makes an angle of 30 degree with original line of motion. Find the speed of the balls after collision.
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Conservation of linear momentum in the direction perpendicular to the initial velocity :
m v1 sin 60° - m v2 sin 60° = 0
v1 = v2
conservation of linear momentum in the direction of initial velocity of the first ball:
m u = m v1 cos 30° + m v2 cos 30°
9 = 2 v cos 30 = 2√3 v
v = 3√3 /2 m/s = 2.6 m/s
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