the displacement of particle moving along x-axis is given by X= 20t³+5t²+2t² .calculate the instantaneous velocity at time=3 sec
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instantaneous displacement when time is 3sec is derivative of 20t³+7t²
60t²+14t.
=>60(3)²+14(3)
=>540+54=594
instantaneous velocity = 594/3 = 198
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