Answer:
F' = 9F
Step-by-step explanation:
The complete question is "Objects 1 and 2 attract each other with a electrostatic force of 36.0 units. If the charge of Object 2 is tripled, then the new electrostatic force will be _____ units".
The electric force is given by :

If F = 36 units,

If charges are tripled, q₁' = q₂' = 3q₁ and 3q₂
So,

So, the new force becomes 9 times of the initial force.