A particle of mass m, initially at rest, is acted upon by a variable force F for a brief interval of time T. It begins to move with a velocity u after the force stops acting. F is shown in the graph as a function of time. The curve is an ellipse.

(1) u=πF022m

(2) u=πT28m

(3) u=πF0T4m

(4) u=F0T2m

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