Compare the two types of optical telescopes

Part of molten rock at mid-ocean ridges

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

What can be done to make a solid solute dissolve faster in a liquid solvent?