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
(a) 136 N
(b) 134 N
(c) 158 N
(d) 68 N
The force acting on the body at t = 2 seconds is - (a) 136 N
