D1 compare and contrast the use of D’Alembert’s principle with the principle of conservation of energy to solve an engineering problem?

Posted on 2016-05-11 18:01:00 in Engineering by DYLAN

im doing a practise paper and this come up and I have no clue where to start to answer this 
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A block with a mass of 5kg is pulled up an incline with an angle of 20°. (See figure 2). The coefficient of friction is 0.2. The distance from A to B is 10 metres. The block accelerates uniformly from 1msˉ¹ at point A to 5msˉ¹ at point B. Calculate: 

a) The pulling force which is producing the acceleration 
b) The work done in moving the block from A to B 
c) The average power required in moving the block from A to B

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