a 1.50-kg object is held 1.20 m above a relaxed mass- less, vertical spring with a force constant of 320 n/m. the object is dropped onto the spring. (a) how far does the object compress the spring? (b) what if? repeat part (a), but this time assume a constant air-resistance force of 0.700 n acts on the object during its motion. (c) what if? how far does the object compress the spring if the same experiment is performed on the moon, where g 5 1.63 m/s 2 and air resistance is neglected?