Work, Power and EnergyHard

Question

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 force F(t) varies with t as shown in the figure. The kinetic energy of the block after 4.5 seconds is
            

Options

A.4.50 J
B.7.50 J
C.5.06 J
D.14.06 J

Solution

Area under F-t curve = 4.5 kg-m/sec
K.E. = = 5.06 J

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