Alan, Dabir and Harum test three zip wires to find which one is the fastest. Dabir oils his trolley before he makes his trip but the others do not. Alan swings
about on his journey and travels 60 metres in 1 minute, Dabir lies back so his
body is vertical and travels 90 metres in 1 minute, Harum makes a star shape
and ravels 120 metres in 1 minute.
a) What force may be affected by oiling one trolley and not the other?
b) What force may be affected by the positions of Dabir and Harum’s bodies?
c) 'Show your working to calculate the speeds in km/hr of:
(i) Alan
(ii)Dabir
(iii)Harum

Hello how was your day? ? i hope it was good

The correct answer is c. hope this

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.