At time t , the position of a body moving along the x-axis is x = t 3 - 6 t 2 + 9 t m . The deceleration of the body at 1 s is

Question

At time t , the position of a body moving along the x-axis is x = t 3 - 6 t 2 + 9 t m . The deceleration of the body at 1 s is, 6 m s - 2, 4 m s - 2, 8 m s - 2, none

MARKS App · Accepted Answer

Given x = t 3 - 6 t 2 + 9 t a = d 2 x d t 2 = 6 t - 12 at 1 s acceleration a = 6 - 12 = - 6 m s - 2 or deceleration = 6 m s - 2

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