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+# Example 6     Chapter 11       Page no.: 359
+# Estimating Acceleration
+
+T <- c(5,6,7,8,9) # Time
+S <- c(10.0,14.5,19.5,25.5,32.0) # Distance
+
+#distance time function
+ss <- function(t1){
+  s <- S[t1-4]
+  return(s)
+}
+
+#Difference value h 
+h1 <- 1
+
+#Acceleration is given by second derivative of distance
+
+a <- function(t,h){
+  return((ss(t+h)-(2*ss(t))+ss(t-h))/(h^2))
+}
+
+h1 <- 1
+t1 <- 7 # given time
+
+cat("Acceleration of car at t=",t1,"s is",a(t1,h1),"km/s^2")
+\ No newline at end of file