Question

Explain Work Energy Theorem.

Plss help me ! ​

Answer 1

Answer:

The work-energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy.

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Answer 2

★Answer

✰ The workdone can be converted into kinetic energy or potential energy and kinetic energy or potential energy can be converted into workdone.

✰ Consider an object , of mass 'm' moving with initial velocity 'u' after experiencing force 'F' the object covered the distance 's' and acceleration of a body is 'a' .Let 'v' be the final velocity.

The force is against the gravity.

✍︎ From 3rd Kinematical equation,

v²= u²+2(-a)s _______ (-a) - opposite direction.

v²= u² - 2as __________(1)

multiply by m/2

$\frac{ {mv}^{2} }{2} = \frac{ {mu}^{2} }{2} - \frac{2asm}{2}$

➙ asm = mu²/ 2 - mv²/2

➙ (ma) s = ½mu² - ½mv²

➤ where, Force = mass× acceleration

F= ma.

put "F" in the place of ma .

➙F.s= (K.E) initial - (K.E) final.

➤ where W = force × displacement

W = f.s

➙ W= (K.E) initial - (K.E) final.

Hope it helps!