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Throw and drop problem

By: Ramirez, Adolfo

Pr.6

If I’m walking on the stairs and my cell phone falls from a 30 ft height how long would it take for my cell phone to break?

h= -16t²+s

0= -16t²+30

-30         -30     

-30=-16t²

-16  -16

1.87=t²

t=±1.36

If I throw a water balloon at my dad from a building that is 40 feet high and a downward velocity of 10 ft/sec and if I miss how long will it take the water balloon to almost hit my dad?

h=-16t²+vt+s

0=-16t²-10t+40

a= -16

b= -10

c= 40

x= -b±√b²-4ac

              2a

X= +10±√-10²-4(-16)(40)         

                     2(-16)

X= +10±√100+2,560

                     -32

X= +10± 51.58

              -32

X= +10+ 51.58   x = -1.92 sec

              -32

X= +10- 51.58    x = 1.29 sec

              -32