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    				| 1. | of mass 2kg moves on a smooth horizontal plane under the action of a single force3i4+ 4 j) newton. Under this force it is displaced from (0,0) to (-1m, 1m). Find the work done by4.icleF (in Joule) | 
| Answer» Given force = 3i+4jand ,the displacement vector is given by p2 - p1 ds = -1i +1j now , work done will be = F.ds = (3i+4j)•(-i+j) = -3+4 = 1J | |