Physics
The following particles move with same kinetic energy. Which of them has maximum momentum ?

Proton
Electron
Deutron
Alpha Particle

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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
No frictional force may be produced between the tracks and the wheels of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train

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