A horizontal spring of constant 150Nm−1 is fixed to a wall. A block is attached to its free end and, after being displaced slightly, the system is observed to execute 0.80s oscillations.
(i) Find the mass of the block.
(ii) The block is now replaced by another whose mass is 36% less than the original one, while the spring remains the same. Calculate the new time period of oscillation.
(iii) Determine the percentage change in frequency resulting from this replacement.