26_Physics ProblemsTechnical Physics

26_Physics ProblemsTechnical Physics - Chapter 2(b 27...

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Chapter 2 27 (b) Assuming that vv f = 4 and recognizing that v i = 0 , the average acceleration during the race was a fi = = +++ () = total elapsed time ft s s ft s 2 57 4 0 25 2 24 0 23 8 23 0 0598 . .... .. P2.14 (a) Acceleration is the slope of the graph of v vs t . For 0 5 00 << t . s , a = 0. For 15 0 20 0 s s t , a = 0 . For 50 150 s t , a tt = . a = −− = 800 15 0 5 00 160 . m s 2 We can plot at as shown. 0.0 1.0 10 5 01 5 2 0 t (s) 1.6 2.0 a (m/s 2 ) FIG. P2.14 (b) a = (i) For 5 00 15 0 s t , t i = 500 s , v i = m s , t v a f f = = = = = 15 0 15 0 5 00 . . s ms 2 a f (ii) t i = 0, v i = m s , t f = 20 0 s , v f = m s a = = = 20 0 0 0800 . m s 2 P2.15 xt t =+
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