A rotten cranberry will lose at least 90% of its total energy during a bounce. If the cranberries are dropped from a height of 10 cm, what is the minimum height in cm of the wall so that no rotten cranberries could ever bounce over it?

Details and assumptions
Neglect any air resistance.
You may assume the path of the cranberries are almost vertical.

Question

A rotten cranberry will lose at least 90% of its total energy during a bounce. If the cranberries are dropped from a height of 10 cm, what is the minimum height in cm of the wall so that no rotten cranberries could ever bounce over it?

Details and assumptions
Neglect any air resistance.
You may assume the path of the cranberries are almost vertical.

fifciol · Answer

total energy mgH - lose of energy (90% mgh) = energy left mgh
so mgH - 0,9mgH = mgh
so 0,1H=h

anonymous · Answer

So what is the height of the wall?