An athlete swims the length of 50m pool in 20sec, and
takes the return to the trip in 22 sec.
find the average veloity and speed
in the first half of the swim and in the second half of the swim. pls me . i need to know the answer.!

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