What is the angle between `veca` and the resultant of `veca+vecb` and `veca-vecb` ?

Answer

`R=Kv^(2)/g`

Explanation

`R prop v^(a)g^(b) rArr [L]=[LT^(-1)]^(a)[LT^(-2)]^(b)`
`rArr a+b=1, -a-2b=0`
`rArr a=2, b=-1 rArr R prop v^(2)/g`