Answer:
7
Explanation:
A substance that is neither acidic nor basic is neutral. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral.
Explanation:
We know that kWh is a commercial unit of energy.
Also, 1 Joule = 1 watt × 1 seconds

Since ,1 h = 3600 s and 1kW = 1000 W

So, the relation is : 
1 watt is defined as the power of an appliance when the energy is transferred at a rate of 1 Joule per second.
The force he must exert is 300 N