If at any point on the path of a projectile its velocity is $u$ at inclination $\alpha$ then it will  move at right angles to former direction after time

  • A

    $\frac{u}{g \cos ec \alpha}$

  • B

    $\frac{u}{g \sin \alpha}$

  • C

    $\frac{u}{g \cos \alpha}$

  • D

    $\frac{u}{g \sec \alpha}$

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