## destineeeee 2 years ago 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

1. destineeeee

I have a=-2.5 mi/hsquared S

2. destineeeee

3. mailtoarko

simple formula v = u - at put v = 30 u = 60 t = 12*60

4. mailtoarko

30=60(1-12a)

5. mailtoarko

12a =.5

6. mailtoarko

a = 1/24 =0.0416 in the negative x direction

7. destineeeee

8. mailtoarko

9. destineeeee

all the possible answers are whole numbers

10. mailtoarko

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

11. destineeeee

no im i thought i saw periods sorry. the answers are -150 -6.0 -450 -2.5

12. mailtoarko

oh ho !! got it . your answers are given in hours . i considered speed in miles/hour but time i made it in seconds !!

13. mailtoarko

correct ans 30 = 60 - 12a a = 30/12 = 2.5 in negative x direction

14. destineeeee

no im i thought i saw periods sorry. the answers are -150 -6.0 -450 -2.5

15. mailtoarko

uff !! i am again wrong correct ans 30 = 60 - 12/60a a = 30* 60/12 = 150 mi/h^2

16. mailtoarko

this time i really got the ans .. after dividing 12/60 i just converted 12min in hours

17. destineeeee

which one would it be out of those 4?

18. mailtoarko

-150

19. destineeeee

thanks