Newton's second law:
ΣFA = ma
mAg - NA = mA (-a)
NA = mAg + mA a
This implies that NA > WA
Two crates, A and B, are in an elevator as shown. The mass of crate A is greater than the mass of crate B. As the elevator approaches its destination, its speed decreases (it continues to move downward).
Rank the forces on the crates according to the magnitudes, from largest to smallest (explain the reasoning, include how to use Newton's second and third laws.)
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