Question

A body of mass 20kg has kinetic energy of 1000J.Its speed is?​

Answer 1

Answer:

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Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy

Answer 2

Answer:

A body of mass 20kg has a kinetic energy of 1000J. Its speed is 10 m/s.

Explanation:

Given,

mass of the body (m)  = 20 kg

Kinetic energy ( K.E)    =  1000 J

Kinetic energy can be written as,

$\mathrm{K} . \mathrm{E}=\frac{1}{2} \mathrm{mv}^{2}$

where m is the mass of the body and v is its speed.

Rearranging the above equation,

$v^{2} = \frac{2\times K.E}{m}$

$v = \sqrt{\frac{2\times K.E}{m}}$

Substitute the values,

$v = \sqrt{\frac{2\times1000}{20}}$

   = $\sqrt{100} = 10$ m/s  

Ans:

Speed of the object = 10 m/s