According to the law of conservation of energy, energy cannot be a. changed or destroyed b. created and destroyed c. created or destroyed d. created and changed

The correct answer is "created or destroyed".

Explanation:

Law of conservation of energy: It states that the energy is neither created nor destroyed. It can only be converted from form of energy to the another form of energy.

For example, the water is storage at certain height. It has potential energy due to its position. When it is made to fall on the turbine then the potential energy gets converted into kinetic energy. The kinetic energy is due to the motion.

The kinetic energy is used to bring the turbine in motion.

In this case, the potential energy is converted into kinetic energy. The energy is converted from one form to the another form.

Therefore, the correct option is (C).

B ; created and destroyed

Explanation:

According to the law of conservation of energy, energy can neither be created nor destroyed but can be converted from one form to another

Which simply means you can't create energy and at the same time you can't destroy it.

An energy can be converted from one form to another that is from potential energy to kinetic energy

There is no destruction of energy in such a process

what do the notation's look like?

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length