A kid throws a rock down at 5 m/s off a 98 m high bridge. How fast is the rock traveling when it hits the water below?

//(b) both involve the use of levers;

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips.