Chapter 5.4, Problem 31E

To determine

a)

To prove:

$W={\int }_{x_1}^{x_2}f\left(x\right)dx={\int }_{t_1}^{t_2}f\left(s\left(t\right)\right)v\left(t\right)dt$

To determine

b)

To find:

The work required to hurl a 12-lb bowling ball at 20 mi/h.