The displacement x of a particle in a straight line motion is given by x = 1 - t - t2. The correct representation of the motion is

dxdt=v=-1-2tComparing with v = u + at, we getu = -1ms-1 and a = - 2 ms-2At t = 0, x = 1 m Then, u and a both are negative. Hence, x-coordinate of particle will go on decreasing