Question

a ball moving with velocity of 9m/s collides with another similar stationary ball. After the collision both the balls move in directions making an angle of 30 degree with the initial direction. After the collision their speed will be-

1) 2.6m/s
2) 5.2m/s
3)0.52m/s
4)52m/s

Answer 1

the ans is 2) 5.2 m/s velocity