The figure shows an empty wheelbarrow which weighs 80 N.
The operator pulls upwards on the handles with a
force of 20 N to keep the handles horizontal.
The point marked M is the centre of mass of the
wheelbarrow.

a) draw arrows to show the other two vertical forces that act on the wheel barrow
b) determine
i)the moment of the 20 N force about the centre of the wheel A
ii) the distance between points A and M

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

Answer mechanical energy;