write down the expression of kinetic energy
Answers
Answer:
Energy possed by a body by virtue of its motion is referred to as Kinetic Energy.
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 V
i
=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=V
f
2
−V
i
2
Putting the above mentioned values we get, 2ad=V
2
−0.
That is, a=
2d
V
2
.
Now force is given by, F=ma .
Putting the value of acceleration, we get,
F=m(
2d
V
2
).
As we know that Work done =Fd.
Putting the value of F, we get, Workdone=(
2d
mV
2
)(d)=(
2
mV
2
)=
2
1
mv
2
.
Therefore, the expression for kinetic energy is
2
1
mv
2
Answer:
kinetic energy is the energy possessed by a moving body
Explanation:
example : a moving car