(1) uniformly accelerates linear motion, and the displacement difference in adjacent equal time is constant, so it is enough to prove that the displacement difference in adjacent time intervals is constant;

According to the inference of uniform linear motion, △h=aT2:

a=h3？ h24T2=0.07 13？ 0.03 18? (0.03 18? 0.008)0.042=9.8 1m/s2，

So the answer is: (1) It is proved that the displacement difference between adjacent time intervals is constant;

(2)9.8 1