Question

8 the answer is 12 but i dont know how??

Answer 1

hey buddy !! here's your answer ...

W = F. S

=( -î +2j + 3 k ). 4k

= 0 + 0 + 12 ( since it is a dot product )

W = 12 J ✔️✔️

hope it helps !! ❤️❤️

Answer 2

Force applied in direction of z-axis is 3 N and distance covered by the body in that direction is 4m As you know formula of work done is product of force and distance covered  So answer is 3*4=12 J