A car is able to go from 0 - 60 mi/h in 3 seconds. How long does it take (in seconds) to go from 0 to 4 mi/h?

To determine the time it takes for the car to go from 0 to 4 mi/h, we can use the concept of acceleration.

Acceleration is the rate at which speed changes. It is calculated using the equation:

acceleration = (final velocity - initial velocity) / time

In this case, the initial velocity is 0 mi/h and the final velocity is 4 mi/h.

We can rearrange the equation to solve for time:

time = (final velocity - initial velocity) / acceleration

The acceleration of the car can be calculated using the rate at which it goes from 0 to 60 mi/h in 3 seconds:

acceleration = (60 mi/h - 0 mi/h) / 3 seconds

Now we can plug the values into the equation to find the time it takes to go from 0 to 4 mi/h:

time = (4 mi/h - 0 mi/h) / ((60 mi/h - 0 mi/h) / 3 seconds)

Simplifying the equation:
time = (4 mi/h) / ((60 mi/h) / 3 seconds)
time = (4 mi/h) * (3 seconds / 60 mi/h)

Now we can cancel out the units to find the time in seconds:

time = (4) * (3 / 60) seconds
time = 0.2 seconds

Therefore, it takes 0.2 seconds for the car to go from 0 to 4 mi/h.