ch02-p072 - 72. (a) A constant velocity is equal to the...

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2 12 12 0 total 0 1 12 (/ 2 ) 1 2 pp p rr r p r p vv D v a d Dx d tt t t t t av a v v Dd t −− −Δ − =++=+ + =+ + =+ + 72. (a) A constant velocity is equal to the ratio of displacement to elapsed time. Thus, for the vehicle to be traveling at a constant speed p v over a distance 23 D , the time delay should be 23 /. p tDv = (b) The time required for the car to accelerate from rest to a cruising speed p v is 0 / p tv a = . During this time interval, the distance traveled is
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