1. The problem statement, all variables and given/known data you throw a ball directly upward, giving it an initial velocity of 10.0 m/s. neglecting friction, what would be the maximum height of the ball? (explain why you do not need to know the mass of the ball) 2. Relevant equations now the problem itself i understand. we need Eg=mgh, Ek=1/2mv^2 3. The attempt at a solution Ek=Eg 1/2mv^2 = mgh 1/2v^2 = gh 1/2(10.0)^2 = 9.81h 50/9.81 = h h = 5.1m i understand that we do not have mass and so it must cancel out, but i am confused as to why we do not need to know the mass?