a body of mass 5 kg. intially is at rest. a force of 20N is exertes on the body, what will be the kietic energy after 10 seconds.

Asked by ananya vyas | 7th Feb, 2011, 01:20: PM

Expert Answer:

Dear student
Here, m = 5kg, u = 0, v = ?, F =20 N,
F=ma
or, a  = F/m = 20/5 = 4 m/s2
also, v = u + at
or, v = 0 + ( 4) (10) = 40 m/s
hence K.E. after 10s = (1/2) (5) (40)2 = 4000 J
Hope this clarifies your doubt.
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Answered by  | 7th Feb, 2011, 01:49: PM

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