Answer:
The equation for speed is : distance divided by time.
Hoped I helped-
Sleepy~
When a liquid is cooled, the kinetic energy of the particles, DECREASES..
I believe the answer is c but I’m not 100% sure
Answer: a) 8.2 * 10^-8 N or 82 nN and b) is repulsive
Explanation: To solve this problem we have to use the Coulomb force for two point charged, it is given by:

Replacing the dat we obtain F=82 nN.
The force is repulsive because the points charged have the same sign.