Shame to hear it dude - is always nasty when ur babies take some pain.
Tho i would tend to agree with WelshSmoker - it is thankfully a weed & they will do their utmost not to die! I've had a 4 week old vegging plant fall off the top of a 6ft cupboard & despite loads of leaves being ripped & torn and me having to mash all the soil back into the pot, it went on to produce bud totally fine.
And also, on my current grow, i recently went away for 6 days holiday & regrettably asked my housemate to keep an eye on the plants. When i came back he clearly hadn't checked them at all (despite the obvious fire risk anyway! doh!) and both plants had grown up into my CFL light & about 4 inches worth of growth was totally burnt & crispy. But i just topped them at the point where the burning started & they didn't seem to have a problem with it at all! lol! They're budding like beauties now!
So hopefully, fingers crossed, it will turn out alright for yours - i'd recommend either taping/staking up any bent branches that can be saved, and any that look too badly split or ripped, just chop them off cleanly below where the break is so as to close any open wounds & this will also allow it to direct energy to the new growth which its gonna wanna grow soon.