Which one of the following statements is not true about the motion of a projectile?

  • A

    The time of flight of a projectile is proportional to the speed with which it is projected at a given angle of projection

  • B

    The horizontal range of a projectile is proportional to the square root of the speed with which it is projected

  • C

    For a given speed of projection, the angle of projection for maximum range is $45^{\circ}$

  • D

    At maximum height, the acceleration due to gravity is perpendicular to the velocity of the projectile

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