The position of a particle at time t is given by r = (cos t) i + (sin t) j + t k. Find the speed and the magnitude of the acceleration at any time t. Describe the motion.
A) 
= 
; 
= 
; path is a circular helix
B) 
= 
; 
= 
; path is a circle
C) 
= 
; 
= 2; path is a circular helix
D) 
= 
; 
= 1; path is a circular helix
E) 
= 
; 
= 1; path is a circle
Correct Answer:
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