A light train made of two cars travels at 72 km/h. The mass of car Ais 18 Mg and the mass of car 8is 13 Mg. When the brakes are suddenly apolied, a constant braking force of 19 kN is applied to each car. Determine (a) the time required for the train to stop after the brakes are applied, (5) the force in the coupling between the cars while the train is slowing down.

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A: Static friction,

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A:

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A: Free body diagram of the box from above problem -

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: