50=.5*20V^2

Solution for 50=.5*20V^2 equation:

Simplifying
50 = 0.5 * 20V2

Multiply 0.5 * 20
50 = 10V2

Solving
50 = 10V2

Solving for variable 'V'.

Move all terms containing V to the left, all other terms to the right.

Add '-10V2' to each side of the equation.
50 + -10V2 = 10V2 + -10V2

Combine like terms: 10V2 + -10V2 = 0
50 + -10V2 = 0

Add '-50' to each side of the equation.
50 + -50 + -10V2 = 0 + -50

Combine like terms: 50 + -50 = 0
0 + -10V2 = 0 + -50
-10V2 = 0 + -50

Combine like terms: 0 + -50 = -50
-10V2 = -50

Divide each side by '-10'.
V2 = 5

Simplifying
V2 = 5

Take the square root of each side:
V = {-2.236067978, 2.236067978}