A 0.75 kg wood block is pushed 0.2 m into a horizontal spring with a spring constant of 50 N/m and released. a. How much spring potential energy is in the system before the wood block begins to move? b. If the surface is frictionless, what is the kinetic energy of the block as it leaves the spring? c. If the surface is frictionless, what is the velocity of the block as it leaves the spring? d. Assuming the surface is not frictionless, and the wood block leaves the spring at a velocity of 1.32 m/s. How much energy is lost due to friction?

Imagine an isolated positive point charge q (many times larger than the charge on a single proton). there is a charged particle a (whose charge is much smaller than charge q) at a distance from the point charge q. on which of the following quantities does the magnitude of the electric field created by charge q at particle a's position depend? check all that apply.the type of the charge on the charged particle athe relative orientation between q and a (while the distance between q and a is fixed)the specific location of the charged particle a (while the distance between q and a is fixed)the amount of the charge on the point charge qthe specific location of the point charge q (while the distance between q and a is fixed)the distance between the point charge q and the charged particle athe amount of the charge on the charged particle a