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

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

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not require a medium to propagate.
Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves are transverse waves

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