A bird flies off of a cliff, dropping a feather and knocking rocks off the cliff. The rocks reach the ground much faster than the feather. Which energy transformations occur in this case? Choose three correct answers.

As the feather and rocks fall, their gravitational potential energy decreases. Some of that energy becomes kinetic energy, so A is correct. Air resistance also does work on both objects, transferring some energy into thermal energy, which makes C and E correct. The rocks do experience air resistance, so not all of their potential energy becomes kinetic energy; the feather also gains kinetic energy, so not all of its potential energy becomes thermal energy.

AI-written and checked against the verified answer.