Aobject is thrown straight upwards with a speed of 19.6 m/sec. three seconds later, its speed is:
select one:
a. zero.
b. 9.8 m/sec downward.
c. 49 m/sec upward.
d. 29.4 m/sec downward.

What is the relationship between the wavelength of a wave and it's energy?

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

3. which is not a primary color of light? blue red green yellow