Set position at 0, velocity at 0 and acceleration at 0.5 m/s2. Press Play button. When the man hits the wall, press pause. You can change scales (or magnify) to inspect each graph closely

the answer would be a

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

there are no contact forces mentioned on the list of choices that you've provided.

answer(20) psi;