//Given that
h = 0.8  //in meter
l = 2.0  //in meter
m = 2  //in kg
g = 9.8  //in m/s^2

//Sample Problem 8-1
printf("**Sample Problem 8-1**\n")
//Using the definition of 
Wg = m* g* h
printf("The work done by the gravity is %eJ", Wg)