The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
.
?
The magnitude, in meters, of the plane's displacement from the origin is
A. 9.14 × 103.
B. 1.61 × 104.
C. 1.84 × 104.
D. 9.14 × 103t.
E. 1.61 × 104t.
Answer: C
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