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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.
 one year ago
 one year ago
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.
 one year ago
 one year ago

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ilikephysics2Best ResponseYou've already chosen the best response.0
Find the time required to catch the car from the instant the car passes the policeman.
 one year ago

ilikephysics2Best ResponseYou've already chosen the best response.0
Find the distance required for the policeman to overtake the motorist.
 one year ago

zaphodBest 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.
 one year ago

zaphodBest ResponseYou've already chosen the best response.1
ok which one u dont understnd?
 one year ago

ilikephysics2Best 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
 one year ago

zaphodBest ResponseYou've already chosen the best response.1
u can either use the calculator or this formula
 one year ago

ilikephysics2Best ResponseYou've already chosen the best response.0
i tried the calculator and it keeps saying error
 one year ago

zaphodBest ResponseYou've already chosen the best response.1
or insert the values in this http://www.math.com/students/calculators/source/quadratic.htm
 one year ago
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