What is the acceleration of the car? I thought it would be -9.8m/s^2 since it's free...
What is the acceleration of the car? 
I thought it would be -9.8m/s^2 since it's free fall, but the answer is -8.94 m/s^2.
Homework Answers
The car is not in free fall. Free fall refers to the condition when there is only earth's gravity acting on a falling object and no other forces are considered.
Here you have to consider the air resistance.
The problem states that the car goes to 60 mph from 0 mph in 3s, which means it goes from 0 m/s to 26.8224 m/s in 3 s, ---(60 mph = 26.8224 m/s)
using , v = u + at
-26.8224 m/s = 0 + a(3s) --- (we have taken downward to be negative)
or, a = -8.94 m/s2
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