The rotors of a 15800-kg heavy-lift helicopter exert a downward force of 324000 N in order to accelerate itself and its external cargo upward at 0.4 m/s2. Part A By itself, what upward force does the external cargo exert on the Earth? Express your answer to three significant figures and include appropriate units. μΑ 11! ? Value IN O You have already submitted this answer. Enter a new answer. No credit lost. Try again.