How do we define energy efficiency? A. The ratio of the actual output energy to the input energy

B. The ratio of the power gain to power loss

C. The product of input power and output power

D. The sum of potential and kinetic energy

use photo math tells u all the answers thats what i use

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.