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ilikephysics2
Group Title
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.
 2 years ago
 2 years ago
ilikephysics2 Group Title
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.
 2 years ago
 2 years ago

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ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.0
Find the time required to catch the car from the instant the car passes the policeman.
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.0
Find the distance required for the policeman to overtake the motorist.
 2 years ago

zaphod Group TitleBest ResponseYou've already chosen the best response.1
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 (t7)) s= ut + 1/2 at^2 ( u = 0) as he strts frm rest \[s = \frac{1}{2} \times 3.7 \times (t7)^{2}\] \[2s = 3.7(t^{2}14t+49)\] \[2s = 3.7t^2 51.8t +181.3\] 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.
 2 years ago

zaphod Group TitleBest ResponseYou've already chosen the best response.1
did u get it ...
 2 years ago

zaphod Group TitleBest ResponseYou've already chosen the best response.1
ok which one u dont understnd?
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.0
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
 2 years ago

zaphod Group TitleBest ResponseYou've already chosen the best response.1
u can either use the calculator or this formula
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.0
i tried the calculator and it keeps saying error
 2 years ago

zaphod Group TitleBest ResponseYou've already chosen the best response.1
or insert the values in this http://www.math.com/students/calculators/source/quadratic.htm
 2 years ago
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