Question

The vector sum of the forces of 10N and 6N can be
(a) 2 N
(b) 8 N
(c) 18N
(d) 20N

Answer 1

think of the min and max possibilities.

min is if they are opposing each other, the difference between them

max is if they are in the same direction, the add together.

all other possible results have to be within this interval

Answer 2

if you have a triangle with sides 10 and 6, what are the possibilites for the third side?