Line of Impact

Q. Consider the statements for an oblique collision of two sphere having different masses and initial velocities;

Statement 1: Initial and final velocity of both the spheres perpendicular to line of impact will remain same.
Statement 2: Impulse due to collision of the spheres will not affect initial velocity of sphere along the line of impact.

1. Statement 1 is true but statement 2 is false.
2. Statement 2 is true but statement 1 is false.
3. Both statements are true.
4. Both statements are false.

Q. Two balls of identical masses undergo perfectly elastic oblique collsion. One of the balls (Ball 1) is initially at rest while the other (Ball 2) is moving with velocity $u$. After the collisions, what angle will the final velocities of the balls make with each other?

1. ${30}^{\circ }$
2. ${45}^{\circ }$
3. ${60}^{\circ }$
4. ${90}^{\circ }$

Q. Two balls of identical masses undergo perfectly elastic oblique collsion. One of the balls (Ball 1) is initially at rest while the other (Ball 2) is moving with velocity $u$. After the collisions, what angle will the final velocities of the balls make with each other?

1. ${30}^{\circ }$
2. ${45}^{\circ }$
3. ${60}^{\circ }$
4. ${90}^{\circ }$