An object of mass 6 kg is traveling at a velocity of 5 m/s . what is its kinetic energy? what will be its kinetic energy if its velocity is doubled?
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Answer:
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Explanation:
since, KE=1/2mv² so, KE=1/2×6×5²
KE=75J
Let 1st velocity u and 2nd velocity v
then, 1st KE= 1/2mu² and 2nd KE=1/2mv²
(given 2u=v)
so, 2nd KE=1/2m(2u)²
2nd KE=2mu²
=> 2nd KE=4×1st KE
therefore, if it's velocity will be doubled then it's KE will be 4 times.
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