A $200$ g

g

glider on a horizontal, frictionless air track is attached to a fixed ideal spring with force constant $150$ N$/$m

N

$/$

m

$.$ At the instant you make measurements on the glider, it is moving at $0\mathrm{.}775$ m$/$s

m

$/$

s

and is $4\mathrm{.}00$ cm

c

m

from its equilibrium point.