In order to calculate how long does it take to stop the car, first let's calculate the car acceleration, using the second law of Newton:
![\begin{gathered} F=m\cdot a\\ \\ -16000=1375\operatorname{\cdot}a\\ \\ a=(-16000)/(1375)\\ \\ a=-11.636\text{ m/s^^b2} \end{gathered}]()
Now, we can use the formula below for the velocity with constant acceleration:
![\begin{gathered} V_f=V_i+a\operatorname{\cdot}t\\ \\ 0=18-11.636\operatorname{\cdot}t\\ \\ 11.636t=18\\ \\ t=(18)/(11.636)\\ \\ t=1.55\text{ s} \end{gathered}]()
Therefore it will take 1.55 seconds for the car to stop.