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5.Work, Energy, Power and Collision
medium
A particle of mass $m$ at rest is acted upon by a force $F$ for a time $t$. Its Kinetic energy after an interval $t$ is
A
$\frac{{{F^2}{t^2}}}{m}$
B
$\frac{{{F^2}{t^2}}}{{2m}}$
C
$\frac{{{F^2}{t^2}}}{{3m}}$
D
$\frac{{F\,t}}{{2m}}$
Solution
(b)Kinetic energy $E = \frac{{{P^2}}}{{2m}} = \frac{{{{(Ft)}^2}}}{{2m}}$$ = \frac{{{F^2}{t^2}}}{{2m}}$ [As $P = F \,t$]
Standard 11
Physics
