The distance covered by a car at a time, t is given by x = 20t + 6t4, calculate (i) the instantaneous velocity when t = 1

(ii) the instantaneous acceleration when t =1

A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

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

How do you count the total number of atoms present on one side of a chemical equation?