Question

Calculate the decrease kinetic energy of a moving body if its velocity decreases to half of its initial ke

Answer 1

hello dear,

$ke_ i}$= 1/2*m*v²

now the velovity decreases by half,

so

v=1/2v

$ke_{f}$=1/2*m*(1/2v)²

                        =1/2*m*1/4v²

change in KE= $ke_{f}-ke_{i}$

=1/2*m*1/4v² - (1/2*m*v²)

=1/4

therefore the final Ke becomes 1/4 of the initial..

Hope this helps you..

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