Revise Mechanics! (1)
A particle of mass \(m\), initially at rest, is acted upon by a variable force \(F\) for a small interval of time \(T\). It then 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 shown is a semi-circle). Then, find the value of \(u\).