48_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 12 Solution: Let t 1 represent the time to full speed, t 2 the time to reache the required distance. Guesses t 1 10 s = t 2 20 s = Given v 3 v 1 at 1 + = d 1 d 2 + d 3 + v 2 t 2 + v 1 t 1 1 2 1 2 + v 3 t 2 t 1 () + = t 1 t 2 Find t 1 t 2 , = t 1 4.167 s = t 2 9.883 s = Now draw the graphs τ 1 0 0.01 t 1 , t 1 .. = s 1 1 v 1 1 1 2 a 1 2 + 1 ft = v m1 1 v 1 a 1 + s ft = 2 t 1 1.01 t 1 , t 2 .. = s 2 2 v 1 t 1 1 2 1 2 + v 3 2 t 1 + 1 ft = v m2 2 v 3 s ft = 024681 0 60
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