Practice: A boat on a river is traveling from a pier to a point 500 m upstream (against the riverâ€™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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Ch 01: Intro to Physics; Units | 1hr & 22mins | 0% complete | ||

Ch 02: 1D Motion / Kinematics | 4hrs & 13mins | 0% complete | ||

Ch 03: Vectors | 2hrs & 43mins | 0% complete | ||

Ch 04: 2D Kinematics | 2hrs | 0% complete | ||

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Ch 14: Torque & Rotational Dynamics | 2hrs & 10mins | 0% complete | ||

Ch 15: Rotational Equilibrium | 4hrs & 8mins | 0% complete | ||

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Ch 25: Electric Force & Field; Gauss' Law | 3hrs & 34mins | 0% complete | ||

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Sections | |||
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Intro to Motion in 2D: Position & Displacement | 13 mins | 0 completed | Learn |

Velocity in 2D | 26 mins | 0 completed | Learn |

Acceleration in 2D | 13 mins | 0 completed | Learn |

Kinematics in 2D | 17 mins | 0 completed | Learn |

Intro to Relative Velocity | 24 mins | 0 completed | Learn |

Concept #1: Intro to Relative Motion (Relative Velocity)

Concept #2: Solving Relative Velocity Problems in 1D

Practice: A boat on a river is traveling from a pier to a point 500 m upstream (against the riverâ€™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?

Example #1: City B lies directly east of city A. Without any wind, an airliner makes the 2775-km flight between them in 3.30h. If a steady 225-km/h wind blows from west to east and the airliner has the same speed relative to the air as before, how long will the trip from A to B take?

A) 7.1 hrs

B) 2.6 hrs

C) 9.0 hrs

D) 5.2 hrs

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