The position

The displacement function S=t3-2t2-4t-8 gives the position of a body at any time t. Find its acceleration at each instant time when the velocity is zero.

Correct answer:

a =  8

Step-by-step explanation:

s = t32t24t8 v = ds/dt = 3t2  4t  4 a = dv/dt = 6t  4 v=0  3 t24 t4=0  3 t24 t4=0 3t24t4=0  a=3;b=4;c=4 D=b24ac=4243(4)=64 D>0  t1,2=2ab±D=64±64 t1,2=64±8 t1,2=0.666667±1.333333 t1=2 t2=0.666666667  t>0 a=6 t14=6 24=8

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