Suppose you have a block resting on a horizontal smooth surface. The block (with a mass of (m)) is attached to a horizontal spring (spring constant (k) in N/m), which is fixed at one end. The spring can be compressed and stretched. The mass is pulled to one side then released. What is the formula required to calculate the period of the oscillation of the mass? If m=100g, and k=150N/m, what are the period and frequency of the oscillation? If the block of mass m were replaced with a block four times more massive, by what factor would the period change? Would the period be longer or shorter?