(a) 9h+d
(b)Height to which the top ball bounces= h(2n+1-1)2
Minimum balls needed to bounce 1 km = 5
For reaching escape velocity=18
Am I Right????
- Shaswata Roy The last 2 solutions are actually 6 and 12.But that was only the calculation bit.Good!:)Upvote·0· Reply ·2014-01-15 08:11:00