Question

Two forces of magnitude 20N and 50N act simultaneously on a body. Which one of the following forces can not be a resultant of the two forces? A.: ; 20 N B.( ) 30 N C.C_i 40 N D.,_,; 70 N

Answer 1

Two forces of magnitude 20N and 50N act simultaneously on a body.
Then, Resultant of forces must be given by formula ,
$\mathbf{F=\sqrt{F_1^2+F_2^2+2F_1F_2cos\theta}}$
you know, cosθ lies between -1 to 1
due to this reason resultant of forces must lies between |F₁ - F₂| and |F₁ + F₂|

Hence, it is clear that resultant of 20N and 50N forces lies (50-20)N = 30N to (20+50)N = 70N
Here only one 20N force out of range.
so, option (a) is correct choice.

Answer 2

Answer:

answer a

20N which is out of range