A student drops a ball off the top of building and records that the ball takes 1.40s to reach the ground. Determine all unknowns and answer the following questions.
Neglect drag.
What was the ball's speed just before striking the ground?
unit
From what height was the ball dropped?
unit

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus

When using the scientist method, which step comes last?

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