Plug and Chug
1. 50 N
2. 2000 N
3. 2.5 N , 5.5 lbs.
4. 1Kg , 2.2 lbs
5. 30.591 Kg
Think and Solve
1. Because the pressure of the crash forces the neck to move backthe headrest helps keep it from slamming backwards
2a. It stays in the same place related to the ground
b. It moves toward the back of the wagon when it accelerates
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