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Help with physics homework?
I need to show on seperate graphs the following problems, graph the problems and answer them(I'll take parts of it too doesn't have to be all)
#1- Starting from rest, Car 1 accelerates to a speed of 30 km/h, Car 2 accelerates to a speed of 35 km/h, Car 3 accelerates backward to a speed of 40 km/h, and Car 4 is still. Which car underwent the greatest acceleration?
#2- A car traveling at 6.9m/s accelerates 4.4m/s^2 to reach a speed of 15.0m/s how long did it take for the acceleration to occur?
1 Answer
- ?Lv 75 years agoFavorite Answer
#1 -- Impossible to answer. To know something about the acceleration, we'd have to know something about the time frame over which the change in velocity occurs.
If the timeframes are all the same, then car 3 has the greatest magnitude acceleration, but car 2 has the greatest acceleration (it's positive).
#2 time t = Δv / a = (15.0-6.9)m/s / 4.4m/s² = 1.8 seconds
To graph this, put time on the horizontal axis and velocity on the vertical.
You have a horizontal line at v = 6.9 m/s, then a line slanting up with slope 4.4 m/s/s until it reaches 15.0 m/s, where it levels off again.
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