9. A student pushed a toy truck on a flat surface that was 10 meters long. At the end of the surface was a wall. The first time he pushed the toy truck, it traveled 4 meters. How far would the toy truck travel if friction was eliminated?

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a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.