Atop fuel dragster covers the quarter mile in 4.5 seconds. what is it's speed in miles per hour

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

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.

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