Explain the similarities and difference(s) between the following set of ions:

Different isotopes indicate that an element will have different numbers of

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

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