Question 1205055
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Your teacher or textbook author is mistakenly using -9.8 when it should be -4.9
However, we can imagine this scenario taking place on another planet with a different acceleration of gravity.


Both functions have -9.8t^2 in them. 
The key difference is the +400 and +200 at the ends of each. 
To go from graph B to graph A, we add 200
B(t) = -9.8t^2 + 200
A(t) = B(t) + 200
A(t) = -9.8t^2 + 200 + 200
A(t) = -9.8t^2 + 400
This moves graph B up 200 units.


In real world context, it means the ball starts 200 meters higher on tower A compared to tower B.
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