HOME    ME    STUFF I DO    FAVORITE LINKS    PIX    HIT ME UP   MATH        

IF I DROPPED MY CELL PHONE AT THE HEIGHT OF 20FT AND BROTHER PUSHED ME AT THE VELOCITY OF -5FT PER SECONDS WHO WOULD HIT THE GROUND FIRST?

DROP:     

                                                         H= -16t² + S

                                                          0= -16t² + 20

                                                       -20              -20

                                                       -20= -16t²

                                                       -16    -16

                                                   √1.25= √t²

                                                  ±1.11 = t

THROWN:

                                                        h= -16t²+vt +s

                                  h = 0

                                  v = -5 ft/sec

                                   t = t

                                   s = 20

                                                        0 = -16t²-5t + 20

                                                        X= -b±√b²-4ac

                                                                  2a

                                           X=-(-5)±√(-5)²-4(-16)(20)

                                                           2(-16)

                                                    X=5±√25+1,280

                                                               -32

                                                         X=5±√1,305

                                                               -32

                                                        X=5±√36.12

                                                                -32

                                                           5+36.12

                                                               -32

                                                           t=-1.29

                                                           5-36.12

                                                              -32

                                                            t=0.97