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    Can some one please please help with this question?

    A lorry of mass 20 tonnes can travel up a slope inclined at 4 degrees to the horizontal at a steady speed of 10ms-1 , when the force produced by the engine is 15.2kN. Assume that the air resistance is proportional to the square of the speed and ignoring other forms of resistance, find the maximum speed of the lorry when freewheeling down the same hill.
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    First, draw a diagram of forces to help you out, then use what you know to calculate the coefficient between the resistance and the speed, then use that to answer the second part of the question
 
 
 

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