d?f accurate with dx2 Obtain forward finite difference approximation of second derivative second order O(Ax?) using proper Lagrange Polynomials for a)unequal mesh size b)equal mesh size c)Find the acceleration at t-2 sec using the derived second order forward finite difference approximation for the following data; Time t(sec) Position x(m) 2 3 10 12 0.7 1.6 3.4 6.3 7.3