I think it’s B because we aren’t looking for Vf
Answer:
A) M
Explanation:
The three blocks are set in series on a horizontal frictionless surface, whose mutual contact accelerates all system to the same value due to internal forces as response to external force exerted on the box of mass M (Newton's Third Law). Let be F the external force, and F' and F'' the internal forces between boxes of masses M and 2M, as well as between boxes of masses 2M and 3M. The equations of equilibrium of each box are described below:
Box with mass M

Box with mass 2M

Box with mass 3M

On the third equation, acceleration can be modelled in terms of F'':

An expression for F' can be deducted from the second equation by replacing F'' and clearing the respective variable.



Finally, F'' can be calculated in terms of the external force by replacing F' on the first equation:




Afterwards, F' as function of the external force can be obtained by direct substitution:

The net forces of each block are now calculated:
Box with mass M


Box with mass 2M


Box with mass 3M

As a conclusion, the box with mass M experiments the smallest net force acting on it, which corresponds with answer A.
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The answer to your question is Aluminum sulfate also plz mark brainliest
Answer:
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A lunar eclipse takes place when the sun, Earth and moon line up in space. The moon passes through Earth's shadow. ... Bottom line: The moon can look red during a total lunar eclipse because of sunlight that's filtered and refracted by Earth's atmosphere