Question

How kinetic energy can be found by work done?​

Answer 1

If we were to plug in for F equals MA and somehow substitute all of this, we will eventually arrive at an equation called the Work Energy Theorem which says that work done equals change in kinetic energy. So work done equals final kinetic energy minus the initial kinetic energy...

Answer 2

Answer:

Relation bewteen KE and W:

Explanation:

The work done on an object by a net force equals the change in kinetic energy of the object:

W = KEf - KEi. (2)

This relationship is called the work-energy theorem.

Proof (for $\vec{F}$ parallel to $\vec{s}$ ):

1.

W = Fs $\Rightarrow$ W = (ma)s (by Newton's second law).

2.

From the third equation of motion: as = (v 2 - v02)/2 $\Rightarrow$ W = 1/2m(v 2 - v02) = KEf - KEi .