Using g = 10 m/s^2, What is the instantaneous speed for a freely falling object dropped from rest a) At the end of the 7th second of fall? and b) The 10th second? How far will a freely falling object fall from rest in a) 5 seconds? b). 6 seconds?
What is the appropriate equation for how fast an object freely falls from a position of rest? b). What is the appropriate equation for how far that object falls?

It is d, all the other ones say incorrect answer .

Definitely the indoraptor

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Iwould think it is temperature, silica, oxides (gases)