A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on ahorizontal frictionless surface. When the spring is 4.0 cm longer than its equilibrium length, thespeed of the block is 0.50 m/s. The maximal extension of the spring from its equilibrium lengthduring the oscillation is:(a) 4.0 cm (b) 2.0 cm (c) 2.8 cm (d) 5.6 cm (e) 11.2 cm