Question

A particle acted upon by forces 3i + 2j + 5k and 2i + j + 3k is displaced from a point P to a point Q whose respective position vectors are 2i + j + 3k  and 4i + 3j + 7k. What will be the work done by the force?

Answer 1

∴ Work done = vector (F x ∆x) = 10 + 6 + 32 = 48 units