A2.00 kg block is placed against a spring on a frictionless 36â° incline. the spring, whose spring constant is 19.8n/cm, is compressed 22.8 cm and then released. what is the elastic potential energy of the compressed spring?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Both independent and dependent clauses

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.