A jogger runs north 6 km, 5 km east, and 4 km north again. Time is 1.9 hr. What is average velocity?

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

The energy released by a nuclear fusion reaction is produced when