urgent! sac tomorrow :( - colinearity

[soopertaco]

How do we prove three point are colinear, using three already defined position vectors

the question might ask show that a,b,c are colinear

i get as far as AB = nBC

then i find AB and BC but then im lost from there, how do i finish this off? or am i even doing it properly?

[jasoN-]

AB = kBC that shows they're parallel
but u also need to show they share the same point
so in this case u just write both share point B or something
and thats colinear

[soopertaco]

hey thanks for clarifying

just wondering, when finding average velocity over a time interval of say [0,10] (this is for vector calculus btw) is it
( v(10) - v (0) ) / (10)  ?

[jasoN-]

average velocity =  displacement / time =