A rock is thrown from the top of a cliff with an initial speed of 0 m/s. If the rock hits the ground after 2.0 s, what is the height of the cliff? (Disregard air resistance.
g = 9.8 m/s2.)

A. 22 m
B. 20.0 m
C. 24 m
D. 63.0 m

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Select all the correct answers. which three statements about electromagnetic radiation are true?

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped