Homework Help: dynamics

Posted by chanz11 on Wednesday, April 18, 2012 at 4:47am.

traveling with an initial speed of 70km/h. a car accelerates at 6000km/hr^2 along a straight road. how long will it take to reach a speed of 120km/hr? also, through what distance does the car travel during this time.?

dynamics - Elena, Wednesday, April 18, 2012 at 4:24pm
v = v(o) +at,
a = (v-v(o))/a =(120-70)/6000 = 8.33•10^-3 h = 30 s.
s =v(o) •t+at^2/2 = 70•8.33•10^-3 + 6000•(8.33•10^-3)^2/2 = 0.79 km

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