differetiate

the distance Sm of a partical from a fixed point O on a line is given at a time Ts. by the formulae S=4 t³- 21t²+ 18t+32. find t when the velocity is zero.
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distans=t^3 -21t^2+18t+32 . . . d/dt=SPEED=3t^2 -42t+18 . . . speed=0... quadratik equashun giv zeroes at t=13.5574385 or 0.4425615
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