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Q.A river flows due east with a speed of 2.8 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.4 m/s due north. The river is 830 m wide.

How far east of his starting point will he reach the opposite bank?What is the magnitude of his velocity relative to the earth?

Q. An object moves at a constant velocity of 11 m/s to the southwest for an interval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity?

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