SOLUTION: I need help with this word problem about velocity please. An angry construction worker throws his wrench downward from a height of 128 feet with an initial velocity of 32 feet p

Question 204099: I need help with this word problem about velocity please.
An angry construction worker throws his wrench downward from a height of 128 feet with an initial velocity of 32 feet per second. The height of the
wrench above the ground after t seconds is given by S(t)= -16t^2-32t+128.
a) What is the height of the wrench after 1 second?
b) How long does it take for the wrench to reach the ground?

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

Looking at the equation, when ,
as it should
When , that is when the
wrench hits the ground
I can find by

Divide both sides by

Use the qudratic equation

(not possible)
answer
It takes 2 sec for the wrench to hit the ground
after sec,

After 1 sec, the wrench is 80 ft above the ground

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