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Question):- In the figure given below, a force F parallel to the slope and having a magnitude of 20 N pushes a block of mass 3 kg with a constant speed. If the initial and final positions of the block are P and Q, respectively, then calculate

(i) the work done by the force in moving the block from P to Q

(ii) the change in potential energy of the block

(iii) the amount of energy lost due to friction

(Take g = 10 m/s^{2})