Expression of kinetic energy ??
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KINETIC ENERGY (K.E) = 1/2 mv²
Explanation:
Energy possessed by a body by virtue of its motion is referred to as Kinetic Energy.
Derivation :
Consider a body of mass 'm' starts moving from rest. After a time interval 't' its velocity becomes V.
If initial velocity of the body is Vi = 0, final velocity V f = V and the displacement of body is 'd'. Then, first of all we will find the acceleration of body.
Using equation of motion 2aS = Vf ²−V i ² Putting the above mentioned values we get, 2ad = V² − 0.
That is, a = V²/ 2d.
Now force is given by, F = ma .
Putting the value of acceleration, we get,
F=m( V² / 2d ).
As we know that Work done = Fd
Putting the value of F, we get,
Work done = (mV² / 2d ) d
= (mV² / 2 )
= 1/2 mV²
Therefore, the expression for kinetic energy is 1/2 mv².
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Answer:
Kinetic energy depends upon the mass and velocity of body. ... Expression for K.E - KINETIC ENERGY-K.E = 1/2 mv2. "Energy posses by a body by virtue of its motion is referred to as 'Kinetic Energy'". Kinetic energy depends upon the mass and velocity of body.