Downward Throwing Level

This is a small level in world A.

There is Book labeled Double Jump. It reads: "By throwing an item downwards, you can jump a second time while you're still in the air. It's simple physics!"

To try this out, pick up the book, jump, and when you are near the top of your arc, press down to throw the book down and give yourself additional upwards thrust to reach the 1 coin and 3 coin.