Suppose `veca` is a vector of magnitude 4.5 unit due north. What is the vector a. `3veca, b -4 veca`?

Answer

(a)13.5unit along north (b) 18unit along south

Explanation

`veca` is a vector of magnitude 4.5 unit due north
(a) `3|veca|=3xx4.5=13.5,`, `3|veca|` is along north having magnitude 13.5 units.
(b)`-4|veca|=-4xx4.5=18units`
`-4veca` is a vector of magnitude 18 units due south.