a 2.0 kg particle moves along an x axis, being propelled by a variable force directed along that axis. its position is given by x " 3.0 m # (4.0 m/s)t # ct2 $ (2.0 m/s3 )t 3 , with x in meters and t in seconds.the factor c is a constant.at t " 3.0 s, the force on the particle has a magnitude of 36 n and is in the negative direction of the axis.what is c