#### Answer

a)
i) 29.3 ft/s
ii) 32.7 ft/s
iii) 45.6 ft/s
iv) 48.75 ft/s
b) 30 ft/s

#### Work Step by Step

a)
i) $\frac{79.2−20.6}{4−2}$
ii)$\frac{79.2−46.5}{4−3}$
iii)$\frac{124.8−79.2}{5−4}$
iv)$\frac{176.7−79.2}{6−4}$
b) The answer should be similar to the average velocity between t=2 and t=4, which we found in part (a) (29.3 ft/s). We can graph a tangent line and get a more precise estimate of 29.7 ft/s.