Scientists first suspected that light is a form of EMR because:

a. light and EMR have the same speed in vcuuo
b. light and EMR slow down in refractive media
c. the wavelength of light lies between the wavelengths of radio and gamma rays
d. light and EMR can produce interference patterns

report

explanation:

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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this would be about 43%