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Cutnell 03.4

Relative Velocity The velocity of an object is relative to the observer who is making the measurement.

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Cutnell 03.4

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  1. Relative VelocityThe velocity of an object is relative to the observer who is making the measurement.

  2. Ex. 11 - The engine of a boat drives it across a river that is 1800 m wide. The velocity vBW of the boat relative to the water is 4.0 m/s, directed perpendicular to the current. The velocity vWS of the water relative to the shore is 2.0 m/s. (a) What is the velocity vBS of the boat relative to the shore? (b) How long does it take for the boat to cross the river?

  3. Ex. 12 - Two cars approach an intersection along perpendicular roads with the following velocities:vAG = velocity of car A relative to the ground = 25.0 m/s, eastwardvBG = velocity of car B relative to the ground = 15.8 m/s, northwardFind vAB, where: vAB = velocity of car A as measured by a passenger in car B.

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