A ball is kicked up in the air over a horizontal surface. Its position (with distances measured in metres) at time t (in seconds after the kick) is given by r=-10ti+(16t-4.9t^2)j, where the origin is at the initial position of the ball and i and j are the Cartesian unit vectors with i pointing horizontally and j pointing vertically up. When it lands, what is the distance in metres of the ball from its initial position, to two significant figures? a) -33 b) 0 c) 5.4 d) 9.8 e) 33