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A light train made up of two cars is traveling at $90 \mathrm{km} / \mathrm{h}$ when the brakes are applied to both cars. Knowing that car $A$ has a mass of $25 \mathrm{Mg}$ and $\operatorname{car} B$ a mass of $20 \mathrm{Mg}$, and that the braking force is $30 \mathrm{kN}$ on each car, determine ( $a$ ) the distance traveled by the train before it comes to a stop, $(b)$ the force in the coupling between the cars while the train is slowing down.

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A. $x=234.381 \mathrm{m}$B. $P=3.3325 \mathrm{kN}$

Physics 101 Mechanics

Chapter 12

Kinetics of Particles: Newton’s Second Law

Newton's Laws of Motion

Rutgers, The State University of New Jersey

University of Washington

University of Winnipeg

McMaster University

Lectures

03:28

Newton's Laws of Motion are three physical laws that, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. These three laws have been expressed in several ways, over nearly three centuries, and can be summarised as follows: In his 1687 "Philosophiæ Naturalis Principia Mathematica" ("Mathematical Principles of Natural Philosophy"), Isaac Newton set out three laws of motion. The first law defines the force F, the second law defines the mass m, and the third law defines the acceleration a. The first law states that if the net force acting upon a body is zero, its velocity will not change; the second law states that the acceleration of a body is proportional to the net force acting upon it, and the third law states that for every action there is an equal and opposite reaction.

09:37

Isaac Newton (4 January 1643 – 31 March 1727) was an English mathematician, physicist, astronomer, theologian, and author (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution. His book Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy"), first published in 1687, laid the foundations of classical mechanics. Newton also made seminal contributions to optics, and he shares credit with Gottfried Wilhelm Leibniz for developing the infinitesimal calculus.

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A light train made up of t…

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light train made up of two…

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'A light train made U…

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A light train made of two …

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A train consists of 50 car…

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The subway train shown is …

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