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A particle moves in a straight line through a fixed point O with a velocity (4-t)m/s find an expression for its displacement S from this point given that S=S when t=0

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S = 4t - (1/2)t^2 + c

"given that S=S when t=0" ?????
I will assume you meant: given that S=0 when t=0

0 = 0 - 0 + c ---> c = 0

S = 4t - (1/2)t^2

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