Q.

The velocity of  a body moving along x direction is related to its displacement as 3x2-2x. Acceleration  of the body at x=2 m is

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a

48 ms-2

b

80 ms-2

c

18 ms-2

d

10 ms-2

answer is B.

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Detailed Solution

v=3x2-2xa=dvdt=dvdxdxdt=6x-2v=23x-13x2-2xputting x=2m         a=26-112-4=80 m/s2
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