A ball initially at rest is dropped from an unknown height. Right before the ball hits the ground, it reaches a velocity of 30 m/s. Assuming air resistance is negligible, calculate the initial height of the object. A.
15 m
B.
30 m
C.
45 m
D.
75 m

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?