Evan is a championship runner of the school's track team. During one of his trials, his speed was measured at 8 m/s. Find Evan's
kinetic energy during that trial if his mass is 58.6 kg.
A-1875j
B-2990j
C-855 J
D-1240J

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

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