Answer:
It will become less negative
Explanation:
When a train moves in a direction with decreasing velocity , then it is for sure than acceleration is also decreasing. With stowaways in between before 1 KM of completion of the journey will bring the vehicle in a situation where it will have negative acceleration. Now it is given that force remains same , then with constant mass it is the acceleration which has to increase in order to justify the equation
[tex]F = m*a[/tex]
Since the acceleration was already negative, an increase in acceleration will make it less negative