Please solve the question Fully and fast! Thanks hero

Problem 8: A block with a mass of 7.50 kg was placed on the spring caused it to stretch 36.8 cm. It was then set in motion with an initial stretch of 15.0 cm. Suppose this experiment was conducted on a moving spaceship with a speed of 0.94c. Determine the period of this spring as it was measured by the observer on Earth by the following sequence: (Kz2, 1:3, Az3, C:2) A. Find the spring constant by sketching the free-body diagram B. Find the period of the spring on the spaceship C. Find the relativistic period, measured by the observer