a 72 kg skydriver drops from a helicopter and is accelerating downwards at 8.6 m/s2. find the friction force acting on him.

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))

B? i feel like this is a trick