How fast would he have been traveling on impact, had air resistance been absent? answer in m/s please!?

The greatest height reported for a jump into an airbag is 99.4m by stuntman Dan Koto. He jumped from rest from the top of the vegas world hotel and casino. He struck the airbag at a speed of 39 m/s (88 mi/h).

for this you can use:

vf^2=v0^2+2ad where vf=final speed, vo=initial speed, a=accel, d=dist

here, v0=0, a=9.8m/s/s and d=99.4m, so:

vf^2=0+2(9.8)(99.4)=1948.2->vf=44.13 m/s

you can see air friction had some effect (lowering speed to 39m/s) but not a huge effect