The forces F1, F2, ..., Fn acting at the same point P are said to be in equilibrium if the resultant force is zero, that is, if F1 + F2 + + Fn = 0. F1 = 3, -6, F2 = 7, -2, F3 = -10, 8

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Q: 31. * Find a resultant wave for the two waves shown in Figure P11.31 at the instant they are…

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”