Answer:
The focal length of a lens is refers to the distance from the center of the lens to the principal foci.
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The correct answer is "Some substances must be dissolved in water before they can be used".
C.an equal and opposite reaction
Most likely B. Will erode, if not it will grow weeds
First you need to find the initial x component which is 13.02. After that you plug it into the 3rd formula on the AP physics formula sheet. Then rearrange it into the quadratic formula and solve for time. The answer should be 4.1 seconds.