CBSE BOARD XII, asked by Balajinaik616, 1 year ago

when a body is at rest in an elevation then it has

Answers

Answered by amulyar
0

Potential energy is not a measurable physical quantity. What can be measured are differences in potential energy. So, if you compare the potential energies of a given mass at the Earth's surface and 100m

100

m

above the surface, you cannot choose their difference, because that is governed by the laws of physics. However, you can freely choose to assign any point in space a specific potential energy (for the mass m

m

). You could define that m

m

's potential energy at the surface is 0

0

, or 1234J

1234

J

, or any other value.


Kinetic energy of a point particle of mass m

m

is defined by mv22

m

v

2

2

, where v

v

is the velocity. "The velocity with respect to what," you may ask. The choice is, again, yours to make; for different frames of references, you get different speeds and kinetic energies, and different notions of "rest". However, as long as m

m

is not accelerating (and m≠0

m

0

), there is always a reference frame in which v=0

v

=

0

and thus Ekin=0

E

kin

=

0

.


So yes, for a body at rest (with regard to an inertial frame) at the surface (or any other point), you could very well claim that it has zero potential and kinetic energy.



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