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Velocity is the rate of change of displacement. The instantaneous velocity of a particle is the first derivative of the expression for displacement.
Here, displacement is given as s = t^2 - 8t + 18.
s' = 2t - 8
At t = 4, s' = 2*4 - 8 = 0
The instantaneous velocity of the particle at t = 0 is 0 m/s.
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