9_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 12 vt () b 1 e c t = s p t 0 t t d = s p t 1 1.839 m = Problem 12–13 The velocity of a particle traveling in a straight line is given v = bt + ct 2 . If s = 0 when t = 0, determine the particle’s deceleration and position when t = t 1 . How far has the particle traveled during the time t 1 , and what is its average speed? Given: b 6 m s 2 = c 3 m s 3 = t 0 0s = t 1 3s = Solution: bt ct 2 + = at t d d = s p t 0 t t d = Deceleration a 1 1 = a 1 12 m s 2 = Find the turning time t 2 t 2 1.5 s = Given 2 0 = t 2 Find t 2 = t 2 2s = Total distance traveled ds p t 1 s p t 2 s p t 2 s p t 0 + = d 8m = Average speed v avespeed d t 1 t 0 = v avespeed 2.667 m s = Problem 12–14 A particle moves along a straight line such that its position is defined by
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