(a).s(t)=−16t2+200ts(6)=−16(6)2+200(6)=1200−576=624fts(b)To determine the average velocityof the particle between1.0sand6.0s,we calculate the values ofs(1.0s)ands(6.0s):s(6)=−16t2+200t=−16(6)2+200(6)=1200−576=624s(0)=−16(0)2+200(0)=0vaverage=6−0s(6)−s(0)=6−0624−0=6624=104fts/sORSince, velocity is the rateof change of distance with timev=dtd(s(t))=−32t+200v(6)=−32(6)+200=−192+200=8v(0)=−32(0)+200=200The sum of the initial and finalvelocity is divided by2to findthe average.The average velocity calculatoruses the formula that shows theaverage velocity(v)equalsthe sum of the final velocity(v)and the initial velocity(u),divided by2.vaverage=2v6+v0=2200+8=2208=104fts/s(c)v(2)=−32(2)+200=−64+200=136fts/s
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