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Stephany was on top of a mountain that was 75ft high. Stephany threw herself with a downward velocity of 50feet high. In how many seconds would she hit the ground?

 

H=-16t2+vt+s                                    

H=-16t2+-50t+75                                        

 

A=-16

B=-50

C=75    

                                               

X =-b±√b2-4ac       x= 50±√-502-4(-16) (75)

              2a                               2(-16) 

                                   

x= 50±√100+4800                 x= 50±√4900

           -32                                           -32

 

X=50+4900                         x= 50-4900

       -32                                         -32

 

X= -154.68                               x= 151.56

 

 

 

Eva was walking up the stairs and Destiny dropped her by mistake from 36ft high. In how many seconds will she hit the ground and go to the doctor?

 

H= -16t2+s

0= -16t2+36 

-36          -36

-36=-16t2

-16    -16t

±-2.25=t

 

T=2.25