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Question: hi im having trouble understanding how to find the radius...

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Hi, I’m having trouble understanding how to find the radius of curvature. Any help would be appreciated thanks.
Problem 2/205 the air 2/206 At a certain instant after jumping from the plane A, a skydiver B is in the posion and has reached a terminal (constant) Un = 50 m/s. The airplane has the same constant speed vA 50 m/s, and after a period of level light is just beginning to follow the circular path shown of radius PA 2000 m. (a) Determine the veloc- ity and acceleration of the airplane relative to the skydiver. (b) Determine the time rate of change of the speed v, of the airplane and the radius of cur- vature p, of its path, both as observed by the non- rotating skydiver. speed Pa = 2000 m 500 m I A UA 350 m
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