a)The distance between two telephone poles is 43m. When a 1.59 kg bird lands on the telephone wire midway between the poles, the wire sags 0.124m. The acceleration of gravity is 9.8 m/s2.  How much tension in the wire does the bird produce? Ignore the weight of the wire. b)A 2183 kg car is coasting along a level road at 29.9 m/s. A constant braking force is applied, such that the car is stopped at a distance of 64.9m. What is the magnitude of the braking force?

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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?”