Question

a body constrained to move along the z axis of a coordinate system is subjected to a constant force F = ( -i +2j +3k) N . what is the work done by the force in moving the body over a distance of 4 m along the z axis.

Answer 1

-i+2j+3k*4i+0j+0k= -4(1)+0(1)+0(1)

................... ... ........ = -4k^