Thank you for the opportunity to help you with your question!
velocity expression, v(t) = ds(t)/d(t) = -3t^2 + 32t + 23
acceleration expression, a(t) = dv(t)/dt = -6t + 32 ................ (0<= t <= 6)
At t = 0, acceleration = 32
at t = 1, acceleration = -6*1 + 32 = 26
Thus car begin to decelerate at t = 1 sec
hi one is not the right time of decelerate
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