DOCX Mr. Blaikie's site - Home Solve the following word problems using the kinetic and potential energy formulas (Be sure to show your work!) Formulas: KE = 0.5 x m x v 2 OR PE = m x g x h v = velocity or speed m = mass in kg g = 9.81m/s 2 h = height in meters You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s.