Question

Find the work done in moving an object along a vector

R = 3i + 2j - 5k if the applied force is
F = 2i-j-k.

Answer 1

Explanation:

Given : r = 3i+2j-5k

f = 2i-j-k

To find : Work done (w)

Formula : w= F.r

Solution :

According to the given formula,

w = F. r

w = (2i -j-k). (3i+2j-5k)

w = [(2*3) - (1*2) + (-1)(-5)]

w = 6-2+5 = 9J

Therefore work done in moving a object is 9J.