A body of mass 2kg travels according to the law x(t) = pt + qt^2 + rt^3 where p = 3ms^–1 , q = 4ms^–2 and r = 5 ms^–3 .

Question 1

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

(A) 136 N

(B) 134 N

(C) 158 N

(D) 68 N

Question 2

Correct option (A) 136 N

A body of mass 2kg travels according to the law x(t) = pt + qt^2 + rt^3 where p = 3ms^–1 , q = 4ms^–2 and r = 5 ms^–3 .

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A body of mass 2kg travels according to the law x(t) = pt + qt^2 + rt^3 where p = 3ms^–1 , q = 4ms^–2 and r = 5 ms^–3 .

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