Physics
The recoiling of gun is an example of which of the following?

Conversion of Kinetic Energy to Potential Energy
Law of Conservation of Angular Momentum
Law of Conservation of Linear Momentum
Law of Conservation of Energy

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Physics
Railway tracks are banked on curves so that

Necessary centripetal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train

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