For level 17 you'll need to first make some kind of shape that connects the up side down "U" with the platform where the ball is. Best way is to make a rectangle beneath the "U" and then block the left area of the level. Now get the ball beneath the "U" and from there you can launch it up by drawing some fast lines beneath the ball. See the video below for an alternative solution.
Physics Drop Level 17 Walkthrough, Solution, Cheats for Android, iPhone, iPad, iPod. Note: This is "Physics Drop" by "IDC Games"