Question

Find u * v, if u= 12j and v = i + 5j
a (1,60)
b (0,60)
c -60
d 60

Answer 1

The correct answer for this problem would have to be D hope this helps:)

Answer 2

Answer: The correct option is (d) 60.

Step-by-step explanation: We are given to find u * v, if the vectors u and v are defined as follows :

`u=12j,~~~v=i+5j.`

We know that

`i.i=1,~~j.j=1,~~k.k=1,~~i.j=j.i=j.k=k.j=i.k=k.i=0.`

So, we have

`u*v\\\\=(12j)*(i+5j)\\\\=12j.i+12j.5j\\\\=12* 0+60* 1\\\\=0+60\\\\=60.`

Thus, the value of u * v is 60.

Option (d) is CORRECT.