a 1 lb gel-filled bag launched at 60 fps, and a 490 gr broadhead arrow travelling at 225 fps. Both have a kinetic energy of 55 ft-lbs. Which would you rather be hit by? The kinetic energy of the gel-filled bag would be completely absorbed on impact, and would be painful but it wouldn't kill you.
If energy killed you could shoot a man in the foot with a 30-06 and he would die.