CHAPTER 2 - 4

# CHAPTER 2 - 4 - 40 v(m/s 30 20 10 0 0 10 20 30 40 50 60 70...

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0 10 20 30 40 50 60 70 80 90 100 110 120 t  (s) 0 10 20 30 40 v  (m/s) 5th gear 3rd gear 2nd gear 1st gear 4th gear 0 10 20 30 40 t  (s) 0 10 20 30 40 50 22. ( a ) The maximum velocity is indicated by the highest point, which occurs at        t  = 50 s . ( b ) Constant velocity is indicated by a horizontal slope, which occurs from        t  = 90 s to 107 s . ( c ) Constant acceleration is indicated by a straight line, which occurs from        t  = 0 to 30 s, and  t  = 90 s to 107 s . ( d ) The maximum acceleration is when the slope is greatest:        t  = 75 s . 23. We find the acceleration (assumed to be constant) from v 2  =  v 0 2  + 2 a ( x 2  –  x 1 );  0 = [(100 km/h)/(3.6 ks/h)] 2  + 2 a (55 m), which gives        = – 7.0 m/s 2 . The number of  g ’s is N  =  | a | / g  = (7.0 m/s 2 )/(9.80 m/s 2 ) =

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CHAPTER 2 - 4 - 40 v(m/s 30 20 10 0 0 10 20 30 40 50 60 70...

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