Question

a body constrained to move along the z axis of a cor

Answer 1

We know that the work done is given as

W = F.s

here

F = -i + 2j + 3k

s = 0i + 0j + 4k

so, we have

W = (-i + 2j + 3k).(0i + 0j + 4k)

thus, we get

W = 3k.4k = 12 J