Not sure. It may charge it, it may not. If it does, it will certainly be slower than the standard iPad charger, as it is a max of 6.5W, versus the standard charger's 10W
We have done this test with the iPad 1 and iPhone 4 and it worked fine.
According to our information, the charge specification of the iPad 2 remains unchanged so we can reasonably assume that it will work perfectly.