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20 14 Minhang district mathematics module 2
(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