What is the final velocity for a body that falls from 40m above the ground use gravity 10m/s^2​

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?

What is the specific heat of wood ?