anonymous
  • anonymous
A motorist travels at a constant speed of 34.0 m/s through a school zone, exceeding the posted speed limit. A policeman waits 7.0 s before giving chase at an acceleration of 3.7 m/s2.
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Find the time required to catch the car from the instant the car passes the policeman.
anonymous
  • anonymous
Find the distance required for the policeman to overtake the motorist.
anonymous
  • anonymous
For Car ( insert the values and get an equation) s = ut s = 34 t ------> (1) equation For Policeman ( he starts 7 s later so it is (t-7)) s= ut + 1/2 at^2 ( u = 0) as he strts frm rest \[s = \frac{1}{2} \times 3.7 \times (t-7)^{2}\] \[2s = 3.7(t^{2}-14t+49)\] \[2s = 3.7t^2 -51.8t +181.3\] Now plug in equation {1} in to s so \[2(34t) = 3.7t^{2}-51.8t+181.3\] i think now u can solve and find time.

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anonymous
  • anonymous
did u get it ...
anonymous
  • anonymous
no?
anonymous
  • anonymous
ok which one u dont understnd?
anonymous
  • anonymous
im at 3.7t^2 - 119.8t + 181.3 = 0 now im working on the quadratic equation but I keep getting it wrong please help
anonymous
  • anonymous
u can either use the calculator or this formula
anonymous
  • anonymous
i tried the calculator and it keeps saying error
anonymous
  • anonymous
Use this...its accurate http://www.google.lk/imgres?q=quadratic+formula&um=1&hl=en&sa=N&biw=1280&bih=675&tbm=isch&tbnid=wOsI1N_cpFKysM:&imgrefurl=http://www.glogster.com/kylie1597/quadratic-formula/g-6mf9s8clhc23fa1opvsbua0&imgurl=http://im.glogster.com/media/4/30/58/45/30584538.jpg&w=549&h=215&ei=6JA9UM3JOMTnrAflp4GYCQ&zoom=1&iact=hc&vpx=328&vpy=359&dur=1323&hovh=140&hovw=359&tx=199&ty=60&sig=106954449408673256726&page=1&tbnh=76&tbnw=193&start=0&ndsp=18&ved=1t:429,r:7,s:0,i:132
anonymous
  • anonymous
or insert the values in this http://www.math.com/students/calculators/source/quadratic.htm

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