A car can go from 0 - 60mi/h in 3 seconds during free fall. How long will it take for this same car to go from 0 - 4 mi/h?
This is hypothetical situation.
The answer I have come up with is 0.2 seconds but my homeowrk system says it is not correct. Is there any reason this should be incorrect?
Since it is a free-fall, assuming no air resistance, the velocity increases uniformly with time.
For a free-fall, it would have taken 2.74 seconds with g=9.8 m/s².
On that basis, I get 0.18 seconds for 0-4 mph. However, based on 3 seconds for 0-60, I get also 0.2 s.
I am also curious to know what homework system do you use.