The observation deck of tall skyscraper 311 m above the street. determine the time required for a penny to free fall from the deck to the street below. (make x negative since the penny is falling)

30 points - 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