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kurtrudviking
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Homework Statement
A motorcycle cop, parked on the side of a highway is passed by a woman in a red Ferrari 308 GTS doing 90km/h. After a few attempts to get his cycle started, the officer roars off 2.00s later. At what average rate must he accelerate if 110km/hr is the top speed and he is to catch her just at the state line 2.00km away?
Homework Equations
The Attempt at a Solution
I first started this question by showing what i know and making all unit conversions i need to.
1)
Cop for first 2 sec
vi= 0 km/hr
Pi=0 m
a=0
Ti= 0
Tf= 2
Cop after 2 sec
vi= 0 km/hr
vf= 110 km/hr
pf= 2000 m or 2 km
Ti= 2
a= X
Woman
vi= 90 km/hr
Pi= o m
a= 0
Tf=2
2) Convert the km/hr into m/s
(110 km/hr) X (1000 m/hr) X (1/60 Min) X (1/60 Sec) = 30.56 m/s (COP)
(90 km/hr) X (1000 m/hr) X (1/60 Min) X (1/60 Sec) = 25 m/s (woman)
3) Then find out how long it takes the Woman to get to the state line.
Woman
Position Final = Vi(T)
2000m = 25(T)
T = 80 sec
4) This means that the cop has 78 sec to catch her because it takes him 2 sec to start his bike.
thats all i got...