#include <iostream>
using namespace std;
 
double displacement(double I, double F,double a)
{
   double D = 0;
 
   if(I <=0 || F <= 0)
   cout<<"\nVelocity should be greater than zero.";
 
    if(a == 0)
   cout<<"\nNo brakes were applied";
 
    if(a <0)
   cout<<"\nThe vehicle is speeding up";
 
    if(F > I)
   cout<<"\nError in acceleration values.";
 
   else
   D = (F*F -I*I)/(-2*a);
 
   return D;
}
int main() {
 
   double I,F,a;
 
   cout<<"\nEnter initial velocity : ";
   cin>>I;
 
   cout<<"\nEnter final velocity : ";
   cin>>F;
 
   cout<<"\nEnter deceleration : ";
   cin>>a;
 
   if(displacement(I,F,a) > 0)
   cout<<"\nDisplacement is "<<displacement(I,F,a);
 
 
   return 0;
}

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