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
The law of conservation of energy states that

Energy can neither be created or destroyed
Energy can either be created or destroyed
Energy can neither be created nor destroyed
Energy can either be created nor destroyed

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Physics
Energy in reflected light :

Decreases with the increase in angle of incidence
Becomes maximum for angle of incidence equal to 45°
Increases with the increase in angle
Does not depends on the angle of incidence

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