a worker poling a boat- a very efficient mode of transportation- across a shallow lake. he pushes parallel to the length of the light pole, exerting on the bottom of the lake a force of 240N. assume the pole lies in the vertical plane containing the boat's keel. at one moment, the pole makes an angle of 35degrees with the vertical and the water exerts a horizontal drag force of 47.5N on the boat, opposite to its forward velocity of magnitude of 0.857m/sec. the mass of the boat including its cargo and the worker is 370kg. (a) the water exerts a bouyant force vertically upward on the boat.

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