A helicopter is lifting two crates simultaneously. One crate with a mass of 385kg is attached to the helicopter cable. The second crate with a mass of 110kg is hanging below the first crate and attached to the first crate by a cable. The helicopter accelerates upward at a rate of 1.20m.s-2 What is the tension in cable T2 of the lower crate in kN?

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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?”