Doubling the initial velocity of a projectile while keeping all other parameters the same the height reached by the projectile increases by?

Correct Answer: C. Four Times

The height reached by a projectile is determined by its initial velocity and the acceleration due to gravity. When you double the initial velocity of a projectile while keeping all other parameters the same, the height reached by the projectile will increase by a factor of four (4x).
This is because the height reached by a projectile is directly proportional to the square of its initial velocity. Mathematically:
Height ∝ (Initial Velocity)^2
When you double the initial velocity, it becomes 2 times the original velocity, and its square is 4 times the original value.