The equation of motion of a particle starting from rest along a straight line is x = t3 – 3t2 + 5. The ratio of the accelerations after 5 sec and 3 sec will be

A centroid of a triangle is the point where the three medians of the triangle meet. A median of atriangle is a line segment from one vertex to the mid point on the opposite side of the triangle. The centroid is also called the center of gravity of the triangle.