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A ball is thrown straight upward at an initial speed of v0 = 40 ft/s... Help please.

Use the formula
h = -16t2 + v0t.
A ball is thrown straight upward at an initial speed of v0 = 40 ft/s.

(b) When does it reach a height of 56 ft?
t =

(c) What is the greatest height reached by the ball?
h =

(d) When does the ball reach the highest point of its path?
t =

(e) When does the ball hit the ground?
t =

math   precalculus   
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ref.  https://www.homeworklib.com/question/1530919/falling-body-problems-use-the-formula-discussed 

answered by: dangdang
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