Mathematics, 20.09.2019 01:20 hunttj
After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is 5.1 m/s2; after 3.6 s he enters the main speedway. at the same instant, another car on the speedway and traveling at a constant velocity of 71.3 m/s overtakes and passes the entering car. the entering car maintains its acceleration. how much time is required for the entering car to catch up with the other car?
Answers: 2
is the initial speed (which is zero given that the car starts froms rest), 
is the car's accelaration and 
is the time passed until it reaches the main speedway.
at a time 
can be calculate using the following equation:
(equation 1)
the point where the first car enters the main speedway. If 
is the point where this car catch up with other one after 
seconds, we may rewrite the equation 1 like this:
(equation 2)
when it meets the entering car. Then, its displacement 
after 
(equation 3)
, so when can find how much time this will require equaling equations 2 and 3 and isolating 
![[\frac{1}{2}(a*t_2)-(v-s_1)]*t_2=0](/tpl/images/0244/7778/59754.png)
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After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is...
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