typo openchrono

input/projects/openchrono.md

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-The measured speed / energy seeme a bit low.
+The measured speed / energy seems a bit low.
 I suspect that's because I was using a propane magazine with a Co2 slide spring.
 Another topic is the weight of the OpenChrono device.
 When attaching large weights to the front of a 1911-style mechanism, the force required to actuate the slide is much larger.