Question

If F= 2i+j+3k, S=i-2j+3k find work​

Answer 1

Answer:

9 is the correct answer

Explanation:

work = 9

Answer 2

Answer:

work W = 9 joules

Explanation:

to find the work done we have the formula

W=FS

W=(2i+j+3k)(i-2j+3k)

w=(2i*i)+(j*-2j)+(3k*3k)

W=2i^2 +(-2j^2)+9k^2

.: i^2=j^2=k^2=1 so

W=2+(-2)+9

W=2-2+9

W=9 joules