Question

A vertical spring has one end attached to the ceiling and a 2.50 kg weight attached to the other one. When the system is at rest, the spring is stretched by 20.0 cm. Now let the weight drop from a position in which the spring is not deformed at all.Use the conservation of energy law to find : a) how fast the weight is moving after it drops 20.0 cm B)How far down the weight will drop before starting to come back.
Timo
can someone please help