Hello student,

Here's a solution to your query :

To find the resultant

R= √(A2)+(B2)+2ABcosx

As given in the query, the magnitude of the force is same and let it be f whose resultant be f too..

Substituting the variables in the above equation we get

f= √(f2)+(f2)+2(f2)cosx

Squaring on both sides we get

f2=2(f2)+2(f2)cosx

By solving we get

cosx=−1/2

Therefore x=120°

Answer : The angle is 120°

Thank you.