A bullet having mass of 10 gm and moving with a speed 1.5 m/s penetrates a thick wooden plank of 90 gm. The plank was initially at the rest . the bullet get embedded in the plank .

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.