initial commit / add all books

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diff --git a/24/CH8/EX8.2/Example8_2.sce b/24/CH8/EX8.2/Example8_2.sce
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+//Given that

+mass = 2  //in kg

+y1 = 5  //in meter

+g = 9.8  //in m/s^2

+ref = [0, 3, 5, 6]

+

+//Sample Problem 8-2a

+printf("**Sample Problem 8-2a**\n")

+for x = ref

+    U = mass* g* (y1 - x)

+    printf("The potential energy at y1 is %dJ if reference is assumed to be at y=%d\n", U, x)

+end

+

+//sample Probelm 8-2b

+printf("\n**Sample Problem 8-2b**\n")

+y2 = 0

+//The change in potential energy doesn't depend on choice of reference

+deltaY = y2 - y1

+//because the deltaY doesn't depend upon the choice of references

+deltaU = mass* g* deltaY

+printf("The change in potential energy is %dJ same for all the references", deltaU)
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diff --git a/24/CH8/EX8.2/Example8_2_result.txt b/24/CH8/EX8.2/Example8_2_result.txt
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+**Sample Problem 8-2a**

+The potential energy at y1 is 98J if reference is assumed to be at y=0

+The potential energy at y1 is 39J if reference is assumed to be at y=3

+The potential energy at y1 is 0J if reference is assumed to be at y=5

+The potential energy at y1 is -19J if reference is assumed to be at y=6

+

+**Sample Problem 8-2b**

+The change in potential energy is -98J same for all the references 
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