He measured flow rate of water through a 20 mm diameter pipe is 75 l/min. what is the average velocity (in m/s) of water flowing through the pipe

Average velocity of water flow through the pipe = 3.98 m/s

Explanation:

Diameter of pipe = 20 mm

Discharge = 75 L/min

We know that

        Discharge = Area x Velocity

       Discharge = 75 L/min

Substituting

Average velocity of water flow through the pipe = 3.98 m/s

this means that the temperature of both substances will be equal

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.