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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

(1) $\frac{{F}^{2}{t}^{2}}{m}$

(2) $\frac{{F}^{2}{t}^{2}}{2m}$

(3) $\frac{{F}^{2}{t}^{2}}{3m}$

(4) $\frac{F\text{\hspace{0.17em}}t}{2m}$