[" 26) If displacement fo particle is "]...

[" 26) If displacement fo particle is "],[qquad s=(t^(3))/(3)-(t^(2))/(2)-(t)/(2)+6," then velocity of the "],[" particle at "t=4sec" .is "],[qquad [" 付佔 "1.5,21,14.5,3,19.5,4)]16.5]

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