Plz help it really easy

Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j

What kind of simple machine is a catapult?

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius