2. two objects were lifted by a machine. one object had a mass of 2 kilograms, and was lifted at a speed of
2 m/sec. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec.
a. which object had more kinetic energy while it was being lifted?

To find the kinetic energy KE=1/2 × mass × velocity ^2

for object 1 ke= 1/2(2)(2^2)=4 J

for object 2 ke= 1/2(4)(3^2)=18J

meaning object 2 as more kinetic energy.

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.