Acamper paddles 406 meters in 70.0 seconds. what is the average speed ?

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 pressure proportional to the area a- inversely b- directly c- increase d-decrease

Ascientific blank must be testable and capable of being proven false?