greentravis
  • greentravis
Margy is trying to improve her cardio endurance by performing an exercise in which she alternates walking and running 100.0 m each. If Margy is walking at 1.4 m/s and accelerates at 0.20 m/s2 during one of the running portions, what is her final velocity at the end of the 100.0 m? Round your answer to the nearest tenth.
Physics
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greentravis
  • greentravis
Margy is trying to improve her cardio endurance by performing an exercise in which she alternates walking and running 100.0 m each. If Margy is walking at 1.4 m/s and accelerates at 0.20 m/s2 during one of the running portions, what is her final velocity at the end of the 100.0 m? Round your answer to the nearest tenth.
Physics
chestercat
  • chestercat
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dan815
  • dan815
okay so
dan815
  • dan815
she starts at 1.4 m/s and accelerates 0.2 m/s^2 over a distance of 100.0m
dan815
  • dan815
now okay lets suppose it takes t seconds for her to run this 100.0m while she is accelerating

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dan815
  • dan815
now the velocity over this time period will look like v(t) = 1.4 + 0.2 *t <---- tells you the veloicty with respect to the time the distance over this time will look like the area under this graph, as that will tell you how much distance is constantly being covered over this time, now the area has to be = 100 in total, so wee see the time that takes and the final velocity
greentravis
  • greentravis
okay
dan815
  • dan815
|dw:1444179878145:dw|
dan815
  • dan815
|dw:1444179933274:dw|
dan815
  • dan815
this is a trapezoid which can be broken down into a triangle and a rectangle, what is the area of this?
dan815
  • dan815
or u can take the average height of this traepezoid and multiply by the width thats the same thing
dan815
  • dan815
|dw:1444180009855:dw|
greentravis
  • greentravis
so the area would be 6.5 m/s right?
dan815
  • dan815
no the area is 100 m the area is the distance since this is veloicty vs time graph and veloicty * time = displacements or i guess distance here
greentravis
  • greentravis
okay
dan815
  • dan815
this method is probably new to u... just ask me anything u want
dan815
  • dan815
theres also jut a formula u can use, maybe that better for just now
dan815
  • dan815
x(t) = Xi+Vi*t + 1/2at^2 Xi is the initial position taken to be 0 here Vi is initial speed which is 1.4 m/s a is 0.2 m/s^2 and you know total distance was 100 so 100= 0+1.4*t + 1/2 * 0.2 * t^2 solve for t and then use the fact that v=1.4+0.2*t, to find the final velocity
greentravis
  • greentravis
i mean velocity
dan815
  • dan815
velocity or speed same thing here, because this is one just 1 dimension and hes only moving forward so

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