Althaf Hussain
Last Activity: 11 Years ago
Answer (c).
When Particle A arrives back at the top of the tower, it will have the same downward speed as the upward speed it started with; its subsequent motion will be identical to that of Particle B. That va and vb are > vc is clear from the fact that A is freely "dropped" from its maximum height, which is greater than the height of the tower, hence greater than max height of C.