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4. 2D Kinematics

Intro to Relative Velocity

4. 2D Kinematics

Intro to Relative Velocity

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Why is $speed$ considered a relative quantity in physics?
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On still water, Olive can paddle her kayak $5 m / s$ . She wishes to cross a river which flows east at $2 m / s$ . If Olive is standing on the south bank, and would like to reach a point directly across the river on the north bank, at what angle upstream (west of north) should she point her Kayak?
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In the context of relative velocity, when two cars pass each other on a straight road, are they necessarily traveling in the same direction at the moment they pass each other?
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A boat on a river is traveling from a pier to a point 500 m upstream (against the river's current). The current flows at 4 m/s. If the boat makes the trip in 250 s, what is the speed of the boat relative to the water?
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Sam is driving down the road at $30 m / s$ . Toni, who is in front of Sam, is driving $25 m / s$ in the same direction. Toni, watching in her rear-view mirror, sees Sam reach out the window and throw a ball towards her. If Sam sees the ball moving away from him at $10 m / s$ , does Toni see the ball moving towards her, or away from her? How fast is the ball moving according to Toni?
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