1.

Two vectors inclined at an angle `theta` have magnitude `3 N` and `5 N` and their resultant is of magnitude `4 N`. The angle `theta` isA. `90^(@)`B. `cos^(-1)(4/5)`C. `cos^(-1)(3/5)`D. `cos^(-1)(-3/5)`

Answer» Correct Answer - D
`R^(2)=P^(2)+Q^(2)+2PQcostheta`


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