Question

which of the following groups of forces could be equibrium
1)3n,4n,5n
2)4n,5n,10n
3)30n,40n,80n
4)1n,3n,5n

explain in detail plz.

if u know the answer then only answer it otherwise leave it

Answer 1

1 is the right answer
F1 - f2 More than f3 less than f1+f2