A cameraman on a pickup truck is traveling westward at 17 km/h while he videotapes a cheetah that is moving westward 23 km/h faster than the truck. Abruptly, the cheetah stops, turns, and then run at 44 km/h eastward, as measured with a suddenly nervous crewmember who stands alongside the cheetah's path. The change in the animal's velocity takes 1.9 s. What are the (a) magnitude of the cheetah's acceleration according to the nervous crew member (b) magnitude of the cheetah's acceleration according to the cameraman?