Question

what is kinetic energy ?
and derive formula for it


$\large{\orange{\underline{\underline{\bf{saiprakash75746 \:here}}}}}$​

Answer 1

Answer:

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.

Answer 2

Answer:

$\rm{\underline{\underline{Kinetic \: energy \: (symbol \: K.E. \: or \: K:–}}}$

• The energy of a body in motion is called it's kinetic energy. It is defined as follows:–

Kinetic energy of a body is the energy possessed by it due to its state of motion.

• Example:– A falling Harmer when strikes a nail fixed on a wooden block, moves it further down into the block. Thus the moving hammer has Kinetic energy and it does work on the nail.

$\rm{\underline{\underline{Factors \: affecting \: the \: K.E \: of \: \: a \: moving \: body:–}}}$

The Kinetic energy of a moving body depends on the following two factors:–

(I) The mass of the body.

Greater the mass of the body, higher is its kinetic energy.

(II) The speed of the body

More the speed of the body, higher is its kinetic energy.

$\rm\orange{\underline{\underline{Expression \: for \: the \: Kinetic \: energy:–}}}$

If a body of mass m is moving with a speed v, it's kinetic energy is given as

$\rm → K.E. = \frac{1}{2} mv²$

The unit of kinetic energy is Joule (J)