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Q.

A body of mass 2kg travels according to the law x(t) = pt + qt2 + rt3 where p = 3ms-1 , q = 4ms-2 and r = 5ms-3. The force acting on the body at t = 2 seconds is :

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a

136 N

b

134 N

c

158 N

d

68 N

answer is A.

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