How much potential energy does a ball have when it reaches the top of its ascent being 1kg with a velocity of 30msec?

The potential energy of an object at a particular height is given by the formula: Potential Energy = mass x gravity x height. At the top of its ascent, the ball's height is maximum, meaning all of its initial kinetic energy has been converted to potential energy. Therefore, the potential energy of the ball at the top of its ascent is 0.