Can someone help to solve this two problems?

Exercise 3. Forced movement 3. A rope is made of a material such that it is elongated 12in by a weight of 24lb. The 24-lb weight is pulled 6 in below the equilibrium point and is then released. If a force of magnitude 18 8 is acting on the rope, find the equation of the position of the weight as a function of time.

Exercise 4. LRC electrical circuits 4. Find the equation of the charge and the current intensity as a function of time of the LRC circuit that has an inductance of 0.5 herni, a resistance of 20 ohms, a capacitance of 0.002 farads and a voltage of 5 3t