Solving a problem in physics section 29 point 42 mechan

42. The radius vector of a material point changes with time according to the law r = c ∙ t ∙ i + k ∙ t2 ∙ j, where c = 3 m / s, and k = 1 m / s2, and i and j vectors x and y axes . Find the equation of the trajectory of the module to its velocity and acceleration unit at time t1 = 3 c.