A 110 g hockey puck slides across the frictionless surface of an ice rink at 2.2 m/s. It collides with a 420 g water bottle at rest on the ice. The water bottle slides off at 0.84 m/s in the direction of the puck's original velocity. What is the puck's final
velocity?

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.