# If the speed of a body is halved ,what will be the change in its kinetic energy??????????plz answer

too easy one....

as we knw that

K.E1 = 1/2 m v12

if the speed is halfed ...then.

let the new kinetic energy be K.E2

and its new velocity ( v2) = v1/2

K.E2 = 1/2 m v22

K.E2  = 1/2 m( v1 / 2)2  ( since  v2 = v1 / 2 )

= 1/2  m  ( v12 / 4 )

= 1/2  (m v12 )  1 / 4

= 1/4 [  1/2 ( m v12 )]  ( since  K.E1  = 1/2 mv12 )

K.E2  = 1/4 K.E1

Hence , the new kinetic energy must be 1 / 4th of the previous kinetic energy.

• 28

if the speed of the body is halved then the new kinetic energy(K.E._) will be

K.E._ =1/4 K.E.

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prath ,please explain on my ID
• -6
ager anwser nahi aata ha to no write
​did you ynder stand

• -10
if the speed of the body is halved the its kinetic energy will be 1/4
• -1
Hope you will understand
• -8
thanks
• -6
if the speed of the body is halved then the Kinetic energy will be 1/4
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As the kinetic energy of the body is directly proportional to the square of its velocity, therefore if the velocity is reduced to half, the K.E will become one forth.
• -5
Gjfgj
• -5
the new kinetic energy must be 1/4 of the previous kinetic energy
• -2
Speed is half then kinetic energy will become 1/4
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Kinectic energy is directly proportional to the square of speed of a body. So if speed is halved, kinetic energy becomes 1/4th of the original
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