Two forces $F_1 = 3N$ at $0^o$ and $F_2 = 5N$ at $60^o$ act on a body. Then a single force that would balance the two forces must have a magnitude of .......... $N$

  • A

    $3$

  • B

    $5$

  • C

    $7$

  • D

    $8$

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