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

Options

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^(@)`
D. At maximum height, the acceleration due to gravity is perpendicular to the velocity of the projectile

Answer

B