Can anyone check my work and see if it is correct? if not, may someone me?

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

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

Compare and contrast the bohr model and the electron cloud models of the atom.