SOLUTION: if a car can go from rest to 60 mph in 4.5 sec how long will it take the car to accelerate from rest to 30 mph?

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Question 813144: if a car can go from rest to 60 mph in 4.5 sec how long will it take the car to accelerate from rest to 30 mph?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
if a car can go from rest to 60 mph in 4.5 sec how long will it take the car to accelerate from rest to 30 mph?
Find the average acceleration
a = %28Vf+-+Vi%29%2Ft where
a = acceleration
Vf = final velocity
Vi = initial velocity
t = time
:
Initial V = 0, therefore
a = 60%2F4.5
a = 13.333 mph/sec^2
:
Find the time to accelerate to 30
t = 30%2F13.333
t = 2.25 sec