Need help quick please

To balance the seesaw ,you will need 3 newtons on the left part because on the right part we already have three newtons(2N+1N)

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

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.