1. an object in free fall will have an initial velocity equal to zero when: a. it is thrown vertically down
b. it is dropped
c. it's thrown up
d. it is released horizontally

b. It is dropped

Explanation:

If the initial velocity is zero, the object move from rest. That happens if the object is dropped

0.19 m/s and 0.45 m/s

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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