**Potential energy:**

$\overline{)\mathbf{PE}\mathbf{=}\mathbf{mgh}}$

**Kinetic energy:**

**$\overline{)\mathbf{KE}\mathbf{=}\frac{\mathbf{1}}{\mathbf{2}}{\mathbf{mv}}^{\mathbf{2}}}$**

**For aluminum:**

*energy is conserved during the fall and that 100% of the sphere’s initial potential energy is converted to kinetic energy*

Consider the two spheres shown here , one made of silver and the other of aluminum. The spheres are dropped from a height of 2.1 m.

What is the velocity of the aluminum sphere at the moment it hits the ground? (Assume that energy is conserved during the fall and that 100% of the sphere’s initial potential energy is converted to kinetic energy by the time impact occurs.)

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