The mass center of the rear-engine 3200-lb car is at G. Determine the normal forces Na an Nb exerted by the road on the front and rear pairs of tires for the conditions of
(a) being stationary and (b) breaking from a forward velocity v with all wheels locked. The coefficient of kinetic friction is 0.90 at all tire/road interfaces. Express all answers in terms of pounds and as percentage of the vehicle weight.