Physics
A sphere rolls down on two inclined planes of different angles but same height, it does so

In the same time with the same kinetic energy
In the same time
In the same time with the same speed
With the same speed

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Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Refraction of sunlight
Reflection of sunlight

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