Steep safety ramps are built beside mountain highways to enable vehicles with defective brakes to stop. A

Question:

Steep safety ramps are built beside mountain highways to enable vehicles with defective brakes to stop. A 10-ton truck enters a 15? ramp at a high speed v0 = 108 ft/s and travels for 6 s before its speed is reduced to 36 ft/s. Assuming constant deceleration, determine

(a) The magnitude of the braking force,

(b) The additional time required for the truck to stop. Neglect air resistance and rolling resistance.