1/2 * m * v ^ 2 = mgh
torricelli's law is given by the equation above , where m represents the mass , h represents the height , v represents the velocity , and g is a constant . according to the equation for torricelli's law , which of the following is equivalent to the velocity , v ?

a. 2gh
b. 1/2ghm^2
c. the square root of 2gh
d. the square root of 1/2mgh