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Q5. A 12-tonne truck is climbing a 1 in 50 incline (sine) with a tractive resistance of 120 N/ton at 20 km/h. When the brakes are applied the truck comes to rest in a linear distance of 40 m.

Calculate EACH of the following:

(a) The effective braking force applied to the wheels. (10)

(b) The time taken for the truck to reach a speed of 16 km/h rolling back down the incline once the brakes are released. (6)