1.

An object moves along a straight line path from P toQ under the action of a force (4i 3jIf the coordinates of P and Q, in metres, are(3, 3, - 1) and (2,- 1, 4) respectively, then the workdone by the force is17.3k) N(1) +23J(2) -23 J(3) 1015 J(4) 35 J

Answer»

Here the displacement vector is i(2-3)+j(-1-3)+(4+1)k = -i-4j+5k

F = 4i-3j+3k

and W= f.ds = (4i-3j+3k)•(-i-4j+5k) = -4+12+15= 23J.



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