Question

A toaster oven is dropped of the edge of a vertical cliff and hits the ground below. If we ignore air

resistance, which of the following statements are true regarding its mechanical energy?

a) The mechanical energy stayed constant as it fell to the ground

b) The mechanical energy decreased as it fell to the ground

c) The mechanical energy increased as it fell to the ground

d) None of the above statements are true.

Answer 1

The gravity is conservational force, thus the mechanical energy conserved.

Answer: a) The mechanical energy stayed constant as it fell to the ground