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**9th grade physics--just a little trouble!!**

okay ive been sick lately and i need some help on this stuff:

22. Show mathematically that an object can have a negative posiiton but a positive velocity.

23. On a position time graph, compare the instantaneous velocities of an object when the tangent to the curve slopes upward to the right, when the tangnent slopes downward to the right, and when the tangent is horizontal.

24. A stunt car is driven along a flat train car. The stunt car is moving toward the engine of the train. how would you calculate the velocity of the stunt car relative to Earth?

25. Suppose a runner is running aboard an ocean liner at +12 km/h toward the southeast. what is the velocity of the ocean liner relative to the runner?