hdu3940

/*
分析：
    物理题，注意别漏掉步骤就行了。


                               2012-10-15
*/

#include"stdio.h"#include"string.h"#include"math.h"#define g 9.8int main(){double h,v_x,v_y,t,v1,v2,v3;double t1,t2;double ans,ans1,ans2,ans3;double temp;char str[11];while(scanf("%lf",&h)!=-1){scanf("%s%lf%lf",&str,&v_x,&v_y);t1=v_y/g;t2=sqrt(2*h/g+v_y*v_y/g/g);if(strcmp(str,"Red")==0){printf("%.3lf\n",(t1+t2)*v_x);continue;}else if(strcmp(str,"Yellow")==0){scanf("%lf",&t);if(t>=t1+t2){printf("%.3lf\n",(t1+t2)*v_x);continue;}else if(t<=t1){temp=(v_y+v_y-t*g)*t/2;h+=temp;ans=v_x*t;v_y-=t*g;v_y*=2;v_x*=2;t1=v_y/g;t2=sqrt(2*h/g+v_y*v_y/g/g);ans+=v_x*(t1+t2);printf("%.3lf\n",ans);}else{ans=v_x*t;h+=0.5*v_y*v_y/g;h-=0.5*g*(t-t1)*(t-t1);v_y=2*g*fabs(t-t1);v_x*=2;t2=(-v_y+sqrt(v_y*v_y+2*g*h))/g;ans+=v_x*t2;printf("%.3lf\n",ans);}}else if(strcmp(str,"Blue")==0){scanf("%lf%lf%lf%lf",&t,&v1,&v2,&v3);if(t>=t1+t2){printf("%.3lf\n",(t1+t2)*v_x);continue;}if(t<=t1){temp=(v_y+v_y-t*g)*t/2;h+=temp;ans=v_x*t;v_y-=t*g;t2=sqrt(2*h/g+v_y*v_y/g/g);ans1=ans+v1*(t2+t1-t);ans2=ans+v2*(t2+t1-t);ans3=ans+v3*(t2+t1-t);printf("%.3lf %.3lf %.3lf\n",ans1,ans2,ans3);}else{ans=v_x*t;h+=0.5*v_y*v_y/g;h-=0.5*g*(t-t1)*(t-t1);v_y=g*fabs(t-t1);t2=(-v_y+sqrt(v_y*v_y+2*g*h))/g;ans1=ans+v1*t2;ans2=ans+v2*t2;ans3=ans+v3*t2;printf("%.3lf %.3lf %.3lf\n",ans1,ans2,ans3);}}}return 0;}