Question
Question: Three spheres each of mass m are placed at the vertices of an equilateral ∆ of side *l*. Each sphere...
Three spheres each of mass m are placed at the vertices of an equilateral ∆ of side l. Each sphere is moving towards centroid with velocity v. After collision A comes to rest. B continues to move in the same direction with velocity v. Find the direction and velocity of C after collision.
A
C move opposite to B
B
Zero
C
C move in the direction of B.
D
C moves in its direction.
Answer
C move opposite to B
Explanation
Solution
Net angular momentum just before impact = 0 (use ∆ Law). Therefore, after collision net momentum should be zero. To make momentum zero, C shall move in a direction opposite to the direction of B and with a velocity v.
