A cameraman on a pickup truck is traveling westward at 16 km/h while he videotapes a cheetah that is moving westward 25 km/h faster than the truck. Suddenly, the cheetah stops, turns, and then runs at 45 km/h eastward, as measured by a suddenly nervous crew member who stands alongside the cheetah's path. The change in the animal's velocity takes 2.4 s. (Use east as the positive direction.) (a) What is its acceleration from the perspective of the cameraman