# A boy throws a ball straight up with a speed of 21.5 m/s. The ball has a mass of 0.19 kg. How much gravitational potential energy will the ball have at the top of its flight?

##### 1 Answer

Jun 21, 2016

#### Explanation:

At the beginning of the ball's flight, all of its energy can be considered **kinetic energy**. As the ball moves up, it will slow down as its kinetic energy is converted into **potential energy**.

At the top of its trajectory, the velocity of the ball is **energy is conserved**. Mathematically, this can be written as: