Help me solve this i dont understand

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.

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

By what primary heat transfer mechanism does the sun warm the earth?