1. A boat can be rowed at VBW = 7.5 km/h in still water. Assume that all quantities are correct to 2 significant figures. (a) How much time is required to row 1.1 km downstream (East) in a river moving ✓ws = 3.4 km/h relative to the shore? Think & Prepare In all the questions below, think about motion from the point of view of an observer on the boat and the point of view of an observer on the shore. 1. The motion of the boat on water Vgw is the velcoity of the boat from the point of view of the observer on the boat. V Bw = 7.5 km/h. Owe back... 2. Let the velocity of the river with respect to an observer on the shore be Vws = 3.4 km/h 3. The velocity of the boat as seen from the shore, Vas takes into account the motion of the river. VBS = VoW+Vws Enter to 2 significant figures Time required to row 1.1 downstream = [ Think for part (a) When going downstream, the velocity of the boat as observed from the shore will increase or decrease compared to its value in still water? By how much? (b) How much time is required for the return trip? Enter to 2 significant figures Time for the return trip = [ min min

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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.