Home About Me Stuff I do Favorite Links Pix Contact Me MATH PROBLEMS HISTORY  

                                                                                                                                                                                        

                   I’m standing in the top of my house 20ft I see Henry pass by so I throw a tennis ball to Henry with a downward of 15ft per second but I miss. How long it will take to hit ground?   


X=-b±√b²-4ac
                             2a     

h= -16t²+vt+s                      
X= -(-10)±√-10²-4(-16 · 20)                                                                        10±√1180  

                                           2(16)                                                                                                                  -32

0= -16t²+-10t+20ft                                                                                                                       

       10±√100-1280                                                                                                              10±34.35     
                        -32                                                                                                                                           -32

                                                                                                    10+34.35                                                                                                        10-34.35  
                                                                                                                  -32                                                                                                                        -32

                                                                 t = -1.38                                                                                                                                                                              t = .76

                     I’m standing in the back of my truck I drop my keys from 4ft tall how long it will take to hit the ground?                                                                                                                                                                                                                                                                   

h =-16t²+s                                                                                                                                     -4   = Öt² 
                                                                                                                                                                                          

         h = -16t²+ 4                                                                                                                     Ö.25 =Öt²                        
                      -4            -4                                                                                                                                 
                                                                                                                                                                                    0.5 = t       

                  -4 = - 16t²                                                                                                                                                                                                                                 
                                               -16    -16