Question

A force F = i + 5j + 7 k acts on a particle and displaces it displaces it through S = 6i + 9 k. Calculate the work done if the force is in Newton and displacement in metre.

69 J

70 J

74 J

0 J

​

Answer 1

Force F = i + 5 j + 7 k Displacement s = 6 j + 9 k Work done = F . s = ( i + 5 j + 7 k ) . ( 6 i + 0 j + 9 k ) = 6 +0 +63 = 69 units. ... A horizontal force of 50N displaces an object of mass 100kg