balindawmcdotlzzo balindawmcdotlzzo

03-08-2017
Mathematics

contestada

the height of an object dropped from the top of a 320-meter building is given by h(t)= -5t^2+320. how long will it take the object to hit the ground

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raindieou3j5e raindieou3j5e

03-08-2017

0=320-5t^2
320=5t^2
t^2=64
t^2=8^2
t=8

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