You attach a 2.50 kg block to a horizontal spring that is fixed at one end. You pull the block until the spring is stretched by 0.100 m and release it from rest. Assume the block slides on a horizontal surface with negligible friction. The block reaches a speed of zero again 0.500 s after release (for the first time after release). What is the maximum speed of the block (in m/s )? m/s