Doc Brown has calculated his Delorean can accelerate at a rate of 2.52 m/s/s. How far away must he and Marty stand to allow the car to accelerate from rest to a speed
of 39.2 m/s?

The value  is  

Explanation:

From the question we are told that

   The  acceleration is

    The speed to attain is

Generally the time taken is mathematically represented as

=>    

=>    

Generally from the kinematic equation we have that

Here the initial  velocity is  zero i.e  u =  0 \  m/s (it started from rest)

So

=>  

false br

i don't understand. explain it clearly