27. The motion of a particle along a straight line is
described by equation
x = 8 +12t - t3
where, x is in metre and t in sec. The retardation of
the particle when its velocity becomes zero, is
(CBSE AIPMT 2012]
(a) 24 ms 2 (b) zero (c) 6ms-2 (d) 12 ms -2
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