Which of the following types of energy are present at some point in the energy transfer process in a nuclear power plan

Renewable energy is defined as an energy source/fuel type that can regenerate and can replenish itself indefinitely. That is what you need to process and know.

The following types of energy are the following:

Biomass, wind, solar, hydro, and geothermal.

These five are renewable resources and are used often.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.