How is effect of speed on draft expressed?
(a) Ds = D0 + KS^2
(b) Ds = D0 – KS^2
(c) Ds = D0 * KS^2
(d) Ds = D0 / KS^2
I have been asked this question in homework.
My enquiry is from Disc Plough in division Tillage, Disc Plough & Numericals of Farm Machinery