A 1.5−kg block rests on top of a 2−kg block supported by, but not attached to, a spring of constant 40 N/m. The upper block is suddenly removed. Determine the maximum speed reached by the 2−kg block. The maximum speed reached by the 2−kg block is m/s. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.