ex_1_P180_S2010[1] - for the car to go from a complete stop...

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JF' NAME :) q Lvy/u/r/ PHYS 180 Spring 2A1O Feb. 3,2010 Red light, green light A car and a train move together along straight, parallel paths with the same constant cruising speed vo. At t=0 the car driver notices a red light ahead and slows down with constant acceleration -a0. Just as the car comes to a full stop, the lightimmediately turnsgreen, and the car then accelerates back to it original speed vo with constant acceleration ao. During the same time interval, the train continues to travel at the constant speed vo. (A) How much time tr does it take for the carto come to a complete stop? Express tr in tCrMS Of VO ANd AO. DRAWA BOX AROUND YOUR ANSWER. 4f(+):4/oo + (-4.)t Vr(t,\ ? o (B) Howmuch timetedoes it take for the car to go from a complete
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Unformatted text preview: for the car to go from a complete stop to its original cruising speed? Express your answer tz in terms of vo and ao. DRAW A BOX AROUND YOUR ANSWER. /tt-1.(b Ordut 4I (1 ,)= 4Ju = Qu 1, / A A'to €;.- T" h a(€ {r?d, (C) The train does not stop at the stoplight. How far behind the train is the car when the car reaches its original cruising speed again? Fxpress the separation distance in terms of ao and vo. Your answer shoufd be positive. DRAW A BOX AROUND YOUR ANSWER. Vr-Vo rtW| oF Vecrrlnt Fc-c; Vb trr(r) = KCTrLrttu) 5 l/o Vu /^ 1. 4o t TVu' Qo rtWft il: Th.ru (rLi4r,6 ts F L^&t l/ r 4 /r t |tvv = u* 6u ( ( Uvl ;l {c, /,? K"= GTqL TVuL 7 u6 lL' Tr vu' ;, I Y cnn' K \./- -# (\--I {Ltl-t*...
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