//Wagon strikes bumper post
//refer fig. 16.19 
W=500
//Component of weight down the plane Wd
Wd=W/100  //kN
//Track resistance Rt
Rt=2.5  //kN
//u=0
s=30  //m
//Let the velocity of wagon while striking be v m/sec
//Applying work energy equation
v=1.716  //m/sec
//Let spring compresion be x
k=15000  //kN/m
//Applying work energy equation and solving quadratic equation
x=100.2  //mm
printf("\nThe spring will be compressed by %.1f mm",x)