question_answer

The sum of two forces \[\vec{P}\] and \[\vec{Q}\] is \[\vec{R}\] such that\[\left| {\vec{R}} \right|=\left| {\vec{P}} \right|\]. The angle \[\theta \] (in degrees) that the resultant of \[2\vec{P}\]and  \[\vec{Q}\] will make with \[\vec{Q}\]is_________. [JEE MAIN Held on 07-01-2020 Evening]

Answer:

90