Two people take identical Jet Skis acrossa river, traveling at the same speed relative to the water. Jet Ski Aheads directly across the river and is carried downstream by thecurrent before reaching the opposite shore. Jet Ski B travels in adirection that is 35° upstream and arrives at the opposite shoredirectly across from the starting point. (a) Which Jet Ski reachesthe opposite shore in the least amount of time? (b) Confirm youranswer to part (a) by finding the ratio of the time it takes for thetwo Jet Skis to cross 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.