When the mass m hail falls from the height h, the resistance is directly proportional to the square of falling velocity, and the proportional coefficient is K. what is the maximum falling velocity of hail?

When the mass m hail falls from the height h, the resistance is directly proportional to the square of falling velocity, and the proportional coefficient is K. what is the maximum falling velocity of hail?

If the maximum velocity is V, then the square of V multiplied by K is equal to the magnitude of gravity (because with the increase of velocity, the resistance increases gradually. When the resistance increases to balance with gravity, the velocity reaches the maximum, because there is no acceleration any more)
The solution of this equation is v = root (mg / k)