PLEASE HELP A rocket weighs 2.0 x 10^7 N. It’s engines exert 2.5 x 10^7 N of force at lift off. What is the net force applied to the rocket?

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve