Answer:
As a substance reaches the melting point, the particles begin to move faster, causing the substance to become a liquid.
Explanation:
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A textbook would hit the ground first
Factors:
-Textbook weighs most
-Pillow is flat and fluffy not very aerodynamic) also is very light
-Paper airplane will glide to the ground do to its wings and will hit the ground last
The answer is b. The crest.
Hope this helps!