An acorn is thrown straight up at a speed of 3.0 m/s. How high will the acorn go? Ignore air resistance. Up is the positive direction. Hint: what is the velocity of the acorn at its apex?

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.