Question 91052
Hi,<br />

If you got it wrong then can you show us what you did, and we can figure out if it is just a numerical mistake, or a theoretical mistake.<br />

The way I approached it was to find a function giving the height of both of the balls at time t. Then I calculated the distance between them in terms of time and solved the inequality Distance(t) <= 10.<br />

Please post back with your working and someone can help see where your problem is.<br />

Kev