# Homework Help: Simpson’s rule to evaluate this integral

1. Apr 20, 2009

### lokal704

1. The problem statement, all variables and given/known data

A golf ball is hit with a driver and, neglecting almost all physical forces except gravity, follows
the path
y
x x
= − +
2
600 2
The ball is on the ground at x = 0 and at x = 300. We will assume that the ball did not roll when
it hit the ground. We would normally say that the drive was 300 yards long, which is the
distance along the ground that the ball travelled. The actual distance that the ball travelled is
given by the arclength of the parabola
The arclength is given by the integral
∫ 1 [ ] ∫ 1 ( 300 )
2
1
2
2
0
300
0
300
+ y′ dx = + −x / + dx

Problems:

1. Use the integrator on your calculator or Simpson’s rule to evaluate this integral. How far did the ball travel?

2. The graph of the function f axf in Figure 1 consists of three line segments for 0 ≤ x ≤ 8. Each mark along the x-axis in Figures 1, 2, and 3, and each mark along the
y-axis in Figure 1 is 1 unit.

a) What is the total length of the graph?

b) What is f ′axf for 0 < x < 3 ?

c) What is f ′axf for 3 < x < 4 ?

d) What is f ′axf for 4 < x < 8 ?

e) Figure 2 above shows the graph of 1 2 + f ′axf . What are the y-coordinates of the three lines that form its graph?

f) Find the areas of the three rectangles in Figure 3.

g) How are the answers to parts (a) and (f) related?

2. Relevant equations

3. The attempt at a solution

I need help on the applications of the problems below. For the total length the ball goes, I believe it is just the integral, but I cannot decide what to do next.