Once upon a time, in the spring, there was a lonely mass of 9.07185kg hung. Its loneliness is exacerbated by extending the spring 3 inches. As a result, the spring's upper end is given a motion of...

Extracted text: Once upon a time, in the spring, there was a lonely mass of 9.07185kg hung. Its loneliness is exacerbated by extending the spring 3 inches. As a result, the spring's upper end is given a motion of y=4(sin2t + cos2t). Determine: a)Motion Equation b) When t=5s, this is the position.