The graph for position versus time is given for a car. What can you say about the velocity of the car over time?

A. it speeds up all the time

B. it slows down all the time

C. it moves at constant velocity

D. sometimes sometimes

it speeds up and it slows

E. not really sure


it slows down all the time. When looking at a position graph, the velocity is represented by the slope of
the line. Since the slope of the graph is gradually decreasing, so is the velocity.

Physics & Space Science

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Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?

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A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.)

a. 361 b. 636 c. 393 d. 396 e. 383

Physics & Space Science