The physics formula for the speed gain from a fall ([DELTA]v) resulting from a height change of [DELTA]h is [DELTA]v=[check]2 g [DELTA]h where g = the
acceleration of gravity, which is 32 feet per second per second.
They both need to apply additional force to counter the downward force due to the
acceleration of gravity. They are now both gaining height within their respective frames of reference and this requires work.
where [delta] is inertia coefficient (1), and because of the small weight, it is ignored; M is weight of harvester (kg); [V.sub.i] is basic speed (km [h.sup.-1]); t is acceleration time, s; [C.sub.x] is drag coefficient, 1.1; g is
acceleration of gravity, 9.81m [s.sup.-2]; [f.sub.r] is rolling resistance; [V.sub.f] is final velocity, km [h.sup.-1]; [[rho].sub.[alpha]] is air density, 1.23 kg/[m.sup.3]; A is frontal area, 5 [m.sup.2].