Physics
A body of mass 5 kg accelerates from 12 m/s to 20 m/s in 4 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).

10
40
80
20

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
Short wave broadcasts are made by nearby radio stations.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

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Physics
Railway tracks are banked on curves so that

Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
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

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Physics
Acceleration is

Inversely proportional to force
Directly proportional to force
Inversely proportional to mass
Directly proportional to mass

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