Question

Kinetic energy of a body in rest is

1)Non Zero


2)Zero


3)Infinite


4)Can not measurable​

Answer 1

2) zero

If kinetic energy is the energy of motion then, naturally, the kinetic energy of an object at rest should be zero.

Answer 2

Answer:

(2) zero is the awnser

The kinetic energy of a body with mass m moving at a velocity v is one half the product of the mass of the body and the square of its velocity, i.e., KE = 1⁄2mv2. ... Even when a body appears to be at rest, its atoms and molecules are in constant motion and thus have kinetic energy.

A body at rest means it have zero velocity and mathematically kinetic energy =1/2mv^2,if velocity =0 then kinetic energy will be zero.

From Another aspect : i.e in respect to relativity.

If observer and object both are in rest then K.E. =0 as v=0(of object)

If observer is at rest and object is in motion then K.E is not equal to zero as v is non zero .

If an observer is in motion and object is at rest then K.E is no equal to 0 as v is non zero relative to that observer.

If both observer and object are moving with same non zero velocity then K.E is zero as v is zero relative to that observer.