A particle of mass 100 g is projected at time t = 0 with a speed 20 ms -1 at an angle 45° to the horizontal as given in the figure. The magnitude of the angular momentum of the particle about the starting point at time t = 2s is found to be 
kgm 2 / s. The value of K is________. (Take g= 10ms -2 )
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kgm 2 /s
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