Question

D) all
these
Two forces, one of 20 N and the other 10 N, act upon a body. The directions of the forces are
unknown. The resultant force on the body is
(A) Not less than 10 N and not more than 30 N (B) More than 25 N always
(C) Always more than 20 N
(D) Always more than 10 N
​

Answer 1

option (A) is right answer

become here to case i possible only

if the force act in different directions

then resultant will be 10

and if they act in same direction

resultant will be = 30

so answer is between 10 and 30

Answer 2

Because option D does not have an upper bound (a maximum limit) and we know the maximum resultant force, from individual forces of 10N and 20N can be 30N.

Option D implies it can be any force greater than 10N. For e.g.: 100N, which is clearly incorrect and hence option D is incorrect.