Not to flog a dead horse (any more than has already been done), but from
a high-school-physics level point of view you can approach it like this:
A vehicle moving at some given speed has some kinetic energy, as
dictated by the equation E = (1/2)m v^2. How did the vehicle get that
energy? If you're on level ground, then you got it by applying the
engine power for a certain amount of time: E = P t . In SI units power
is measured in Watts, and energy is measured in Watt-hours (the
equivalency in Imperial units is not quite so clear-cut). So the more
power you have, the faster you can dump a certain amount of energy into
your vehicle chassis, and the quicker you'll get to a certain speed.
The fact that you need to apply force at the driving tires' contact
patch, and that you get that by applying torque to the driving axles, is
secondary.
Best regards all,
Theo
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