Question

If ‘k’ is coefficient of air resistance, ‘A’ is frontal area projected by the vehicle in square metres and ‘V’ is vehicle speed(in km/h) then the expession for air resistance ‘A.R’ on the vehicle is _________

(a) A.R = k*A*V^2

(b) A.R = k*A*V^3

(c) A.R = 2k*A*V

(d) A.R = k*A*V

This question was posed to me in exam.

Question is from Performance of an Automobile in portion Introduction of Automobile Engineering

Answer 1

The correct answer is (a) A.R = k*A*V^2

Explanation: The correct expression for air resistance is A.R = k*A*V^2.