if you think in this way

e=mc2

e=c2*m

                            5 4 3 2 1 e=c2*m 1 2 3 4 5


now



                                                        3

                                                        2

                                                        1

                                                  e=d2/t2*m  

                                                         1

                                                         2

                                                         3