Question

State and prove work energy theorem what is the work done by the force f=-i+2j +3k newton in moving a body a distance of 4m along the z axis

Answer 1

F = -i + 2j +3k
initial position vector = R1 = 0i + 0j +0k
final position vector = R2 = 4k
displacement = S = R2 - R1 = 4k

W = F•S
W = (-i + 2j +3k)•(4k)
W = 12J