A swimmer headsheads directly across a river, swimming at 1.32 m/s relative to the water. She arrives at a point 41.0 m downstream from the point directly across the river, which is 67.9 m wide. What is the speed of the river current? Problem 3-56b: What is the swimmer's speed relative to the shore? Problem 3-56c: In what direction should the swimmer head in order to arrive at the point directly opposite her starting point? Give your answer as the angle relative to the direction directly across the river.?

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Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.