I am having problems with this question. I keep getting an answer of 1.87m/s but the answer is 1.47m/s. A glider of mass .150kg moves on a horizontal frictionless air track. It is permanently attached to one end of a massless horizontal spring, which has a force of constant of 10 N/m both for extension and compression. The other end of the spring is fixed. The glider is moved to compress the spring by .180m and then released from rest. Calculate the speed of the glider (a) at the point where it has moved .180m from its starting point, so that the spring is momentarily exerting no force and (b) at the point where it has moved .250m from its starting point.