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use strict;
use warnings;
...
45, galileo experi bodi roll slope act same forc weight effect make co
+nstantli speed up
50, show real effect forc chang speed bodi set move previous thought
45, meant bodi act forc keep move straight line same speed

82: 81, galileo measur us newton basi law motion
47: 45, galileo experi bodi roll slope act same forc weight effect mak
+e constantli speed up
52: 50, show real effect forc chang speed bodi set move previous thoug
+ht
47: 45, meant bodi act forc keep move straight line same speed