In an HVAC system, the purpose of pneumatics is to serve as A. a controller B. conditional air flow C. an energy source D. a source of conditioning

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

answera compound;

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach