WORDS

A water balloon is thrown  from a balding of 20ft is going a speed of 10ft/sec. How long will take to heat the ground.      

PICTURE

FORMULA

h=-16t² +vt+s
h= 0     t=?     v=20     s= 10
0=-16t² +20t+10
a=-16    b=20    c= 10   

PROBLEM

x=-b±√b² -4 (a)(c)  
2(a)
x=-20±√20² -4(-16)(10)
2(-16)
x=-20±√400+640
-32
x=20±√1040
-32
x=20±32.24
-32
x=-20+ 32.24               x=-20-32.24
-32                           -32
x= -0.38                   x= 1.63