destineeeee
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
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destineeeee
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I have a=-2.5 mi/hsquared S
destineeeee
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Is my answer correct?
mailtoarko
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simple formula v = u - at
put v = 30 u = 60 t = 12*60
mailtoarko
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30=60(1-12a)
mailtoarko
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12a =.5
mailtoarko
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a = 1/24 =0.0416 in the negative x direction
destineeeee
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that's the answer?
mailtoarko
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is my answer wrong ??
destineeeee
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all the possible answers are whole numbers
mailtoarko
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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
destineeeee
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no im i thought i saw periods sorry. the answers are -150 -6.0 -450 -2.5
mailtoarko
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oh ho !! got it . your answers are given in hours . i considered speed in miles/hour but time i made it in seconds !!
mailtoarko
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correct ans 30 = 60 - 12a
a = 30/12 = 2.5 in negative x direction
destineeeee
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no im i thought i saw periods sorry. the answers are -150 -6.0 -450 -2.5
mailtoarko
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uff !! i am again wrong
correct ans 30 = 60 - 12/60a
a = 30* 60/12 = 150 mi/h^2
mailtoarko
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this time i really got the ans .. after dividing 12/60 i just converted 12min in hours
destineeeee
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which one would it be out of those 4?
mailtoarko
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-150
destineeeee
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thanks