Question

A force (. 6i+k) produces a displacement (i+3j+2k). The work done by the force is
3) 14 units
4) 36 units
2)22 units
1) 18 units ​

Answer 1

Explanation:

using dot product.

i . i =1 and j . j =1, k . k =1

i . j =0 and j . k=0 ,i . k =0

w = 6 + 2 = 8 units