Two horses are pulling a barge with mass 2x10 kg along a canal, as shown in Figure. The cable connected to the first horse makes an angle of 01 = 30° with respect to the direction of the canal, while the cable connected to the second horse makes an angle of 61= -45°.Find the initial acceleration of the barge, starting at rest, if each horse exerts a force of magnitude 6 ×102 N on the barge (39). Ignore forces of resistance on the barge.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!