An object moves from point x to point y in 20 s, where the velocity at x = 50 km/h and the velocity at y = 5.56 m/s, so the acceleration of this object is​

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