[填空题]
The graphs of displacemenz4q(7+qf;si0cbg qx,c uqzq: t, velocity and a( .37qx,xxguv.3oc et qlzh/wcceleration of a roller coaster in a theme park are shown in the following dia x.c tw,(.73zexo/h xlvuqqg 3gram.
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= .