Q. An ideal spring with a stiffness of 379N/m is attached to a wall, and its other end is attached to a block that has a mass of 16-kg. The spring/block system is then stretched away from the spring's relaxed position until 59J of mechanical potential energy is stored in teh spring. Then the system is released to oscillate freely, with block sliding horizontally on the level, frictionless floor. Find out the speed of the block when the spring is compressed by 13.40 cm.