(Solved): can someone help please. 1) The entire potential energy of a ball is transformed into its kinetic en ...

1) The entire potential energy of a ball is transformed into its kinetic energy by coming on the ground from a certain height. The height at wich the ball was initially placed was $10\mathrm{m}$. The mass of the ball is $1\mathrm{kg}$. Find the gain in the kinetic energy. Find the velocity of the ball just before hitting the ground. Assume that initially, the ball was at a height of $100\mathrm{m}$, and its mass was $4\mathrm{Kg}$. At the bottom of the $9^{\text{th }}$ inning, a player hits a $0.15\mathrm{kg}$ baseball over the outfield fence. The ball leaves the bat with a speed of $36.0\mathrm{m}/\mathrm{s}$ and a fan in the bleachers catches it $7.2\mathrm{m}$ above the point where it was hit. Neglect air resistance.