[填空题]
The graphs of displacement, velocity-aymr3o yulw ra;8 7g* and accel.9 isa0faqup l77,taq eration of a roller coaster in a theme park are shown in the following diagram.
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1. Complete the following table by noting which graph A, B or C corresponds to each function.
When function is displacesment ;the graph is
When function is acceleration ;the graph is .
2. Write down the value of t when the velocity is greatest.
t= .