The cars of the roller coaster have a speed
v=23f(t)/(sec)
at the instant under consideration. As rider B passes the topmost point, she observes a stationary friend
A
. What velocity of
A
does she observe? At the position under consideration, the center of curvature of the path of rider
B
is point
C
. Answer:
i+
j)
f(t)/(sec)