That's the answer. As to s = 0 where t = 0 you are looking for how far it went. So if you don't choose s = 0 then you have to subtract the value to get rid of the extra difference. (If s = 1, t = 1 gives the distance as 2.132 m, and to get the actual distance traveled you need to do - 1 = 1.132.)

-Dan