Answer:
His average speed was 10.3199 m/s.
Explanation:
I feel like it is d . :) it could be a too so idrk
C. This is the idea of "black body radiation". Charcoal/carbon is a "perfect black body". Absorbs all radiation. There's a whole host of stuff about this in physics, including, I think, Planck's (Nobel Prize winner) black body radiation theory.