A 1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. The spring has an undeformed length of 5 in . and a constant
k=34l(b)/(f)t
. Knowing that the collar is released from being held at
A
, determine the speed of the collar and the normal force between the collar and the rod as the collar passes through
B
. The speed of the collar and the normal force between the collar and the rod as the collar passes through
B
are
f(t)/(s)
and lb( ), respectively.