Question

1. Calculate the change in kinetic energy of a moving body, if its velocity reduced to 1/3 of the
initial velocity.
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Answer 1

Answer:

Calculate the change in the kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.

Initial kinetic energy k1=21×m×v2.

Final kinetic energy k2=21×m×(3v)2=91×21mv2.

Change in kinetic energy =21mv2−91×21mv2.

=98×21×mv2.