vector and scalar projections

[M-D]

hi,

i have the vector u=(2,1,-1,5) and v=(1,1,-2,-1). the dot product between them is zero which means that they are perpendicular to each other. I need to find the scalar projection of v on to u and the scalar projection of u on to v. is it still possible to find these scalar projections when the vectors are perpendicular to each other?

thanks in advance

[nubs]

It will just be zero

[lzxnl]

As nubs said, the answer is zero.
If you use the vector resolute formula, which in this case is u.v/v.v * v, you'll find that the vector resolute is the zero vector. Therefore, the scalar resolute is zero.
OR: Draw out a diagram and you'll see that if you decompose u into two components, one parallel to v and one perpendicular to v, u itself IS perpendicular to v, meaning that there is no parallel component.