A block of mass 2 kg is free to move along the x–axis. It is at rest and from t = 0 onwards it is subjected to a time–dependent force F(t) in the $x$ direction. The fore F(t) varies with t as shown in the figure. The kinetic energy of the block after 4.5 seconds is
4.50 J
7.50 J
5.06 J
14.06 J