MATH PROBLEM

               DROP

ERNESTO DROPS A BALL FROM THE ROOF OF 100FT .HOW LONG WILL IT TAKE TO HOT THE FLOOR.

H= -16t²+5

H=0

T=0=-16t²+100

S=100ft                                                 -16t²   -100 

                                                              -16t²   -16t²     = 6. 25 = t²        ± 2.5 = t                         

                  Throw

Ernesto throw a ball from a second floor of the building which is about 20 ft tall if he throw it with an initial velocity of 8ft/sec when will it hit the ground?

0=-16t²+ vt+s

                                               0=-16t²+8t+20                                      x=-b+√b²-4ac

                                                                                                                       2a

H=0                                                x=-(8)+ √(8)²-4(16)(20)

T=t                                                                  2(-16)

V=8                                                         

S=20                                               0=-8+√64-1280

                                                                   -32

                                                        0=-8+√1216

                                                                 -32

                                                         0=-8+35.0

                                                               -32

                             -8+35.0= 0.8                                        -8-35.0= 1.34

                                  -32                                                      -32       

                                                             T=1.34