Yet another physics question i dont understand....please help!!?

Question

I know you might think im a bit dumb for not knowing the answer to this question...but im not much of a physics person,,im better on my english and economics....=)...can u please help me on this question?
1] describe all the energy changes that occur when an arrow is fired from a bow and enters a target. Include the energy changes at the bow, during the flight of the arrow, and the target.
( I dont know what else to right apart from potential energy, total energry and kinetic energy)

Answer 1

The bow acts like a stretched spring, and contains energy given by ∫F(x)*dx, where F(x) is the force on the arrow as a funcion of displacement (x). This is converted to kinetic energy = .5*m*v^2, were m and v are the mass and velocity of the arrow as it leaves the bow. During flight, if the arrow moves upward, some of the kinetic energy is converted to potential energy = m*g*h, where h=height of the arrow above its release point. If the target is at the same elevation as the bow, then the arrow will regain its kinetic energy and will hit the target with the same energy it had when it left the bow (neglecting air friction). When the arrow hits the target its kinetic energy is converted to heat by friction in the target. The energy thus lost = ∫f*ds, where f= frictional force and s = depth of penetration into the target.

Answer 2

Oh, I am helpless. Why dont u ask ur teacher