A 1,500-kg car is sitting at rest in a parking lot. A bike and its rider with a total mass of 60 kg are traveling along a road at 10 km/h. Which system
has more inertia? Why

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.