1.

A ball moving with velocity of 9m/s collides withanother similar stationary ball. After the collisionboth the balls move in directions making an angle of30° withthe initial direction. Afterthe collision theirspeed will be48.(1) 2-6 m/s(2) 5.2 m/s(3) 0-52 m/s(4) 52 m/s

Answer»

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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