What do you think happens to the air in the colloid when the ice cream melts?

The particles absorb energy and start to move faster
:)

Hi, your answer is not correct. this is a cumulative  

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.