Question
The displacement of a particle undergoing rectilinear motion along the x-axis is given by
x = 2t3 +21t2 +60t +6
The acceleration of the particle when its velocity is zero will be
(a) 36 m/sec2
(b) 9 m/sec2
(c) -9 m/sec2
(d) -18 m/sec2.
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