The 800-kg car at B is connected to the 350-kg car at A by a spring coupling. Determine the stretch in the spring in meters if:
(a) the wheels of both cars are free to roll and;
(b) the brakes are applied to all four wheels of car B, causing the wheels to skid. The coefficient of kinetic friction at B is 0.4. Neglect the mass of the wheels.
Extracted text: В k = 600 N/m A 4 3