Determine the velocity of an object with respect to an observer if the object is moving along a medium that moves relative to the observer.
Compare the result of paddling upstream to paddling downstream:
Rosa Boat is paddling upstream at 1.40 m/s relative to the water in a river which is flowing at 0.45 m/s relative to the banks of the river. What is the resultant velocity of Rosa's boat (relative to the banks)? Magnitude only; no + or -.
Resultant Velocity
m/s
Rosa Boat is paddling downstream at 1.40 m/s relative to the water in a river which is flowing at 0.45 m/s relative to the banks of the river. What is the resultant velocity of Rosa's boat (relative to the banks)? Magnitude only; no + or -.
Elora is fishing with her Dad. Their fishing boat moves at 3.03 m/s relative to the water regardless of whether they head upstream, downstream, or across the stream. Suppose the water is flowing downstream at 1.38 m/s. How much time does it take Elora to travel upstream 163 m and then back downstream 163 m to her starting position? (Disregard the time taken to turn.)
Time
s
Ayana and Ashton are in canoes along a stretch of the DesPlaines River. They typically paddle at the same pace and can travel at the same speed as one another (relative to the water). But Ayana heads upstream while Ashton heads downstream. We will define the positive direction as downstream. An observer on the shore observes that Ayana has a velocity of -1.24 m/s and Ashton has a velocity of +2.82 m/s. What is the river velocity? That is, what is the velocity of the water relative to the shore?
Velocity of River
Delilah is a passenger on the city bus. The bus is moving through heavy traffic at a speed of 7.34 m/s relative to the street. Delilah stands up and walks towards the front of the bus at 1.36 m/s relative to the bus. What is Delilah's speed relative to the street?
Speed
Delilah is a passenger on the city bus. The bus is moving through heavy traffic at a speed of 6.12 m/s relative to the street. Delilah stands up and walks towards the back of the bus at 1.36 m/s relative to the bus. What is Delilah's speed relative to the street?
A Sandhill Crane is migrating north in the presence of a strong headwind. The crane flies at 17.6 mi/hr with respect to the air. The wind speed is 8.0 mi/hr. What is the crane's speed with respect to the ground?
mi/hr