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While traveling south on an expressway, a car traveling 60 mph (miles per hour) slows down to 30 mph in 12 minutes due to traffic conditions. Calculate the acceleration

Physics
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I have a=-2.5 mi/hsquared S
Is my answer correct?
simple formula v = u - at put v = 30 u = 60 t = 12*60

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Other answers:

30=60(1-12a)
12a =.5
a = 1/24 =0.0416 in the negative x direction
that's the answer?
is my answer wrong ??
all the possible answers are whole numbers
then probably the answers are wrong because u and i both know that v = u-at is the formula unless any different condition is there in the question . so did u type the question correctly
no im i thought i saw periods sorry. the answers are -150 -6.0 -450 -2.5
oh ho !! got it . your answers are given in hours . i considered speed in miles/hour but time i made it in seconds !!
correct ans 30 = 60 - 12a a = 30/12 = 2.5 in negative x direction
no im i thought i saw periods sorry. the answers are -150 -6.0 -450 -2.5
uff !! i am again wrong correct ans 30 = 60 - 12/60a a = 30* 60/12 = 150 mi/h^2
this time i really got the ans .. after dividing 12/60 i just converted 12min in hours
which one would it be out of those 4?
-150
thanks

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