#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main()
{
	const float RT=6378000, g0=9.8;
	float h,v;

	printf("l'altitude du satellite en metres? ");
	scanf("%f",&h);

	v=sqrt(g0*(RT*RT)/(RT+h));

	printf("%s%f%s","\nla vitesse du satellite=",v,"m*s-1");

	return 0;
}