Need assistance on this Physics question

Aug 31st, 2015
DreamIt
Category:
Physics
Price: $5 USD

Question description

The function f(t)=-5t^2+20t+60 represents the height of the ball t seconds after it's launched. How long does it take to hit the ground? Please explain how you get your answer. 

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(Top Tutor) Daniel C.
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School: Boston College
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