A ball is thrown from a height of 164 feet with an initial downward velocity of 12/fts. The ball's height
h (in feet) after t seconds is given by the following.
=h−164−12t16t2
How long after the ball is thrown does it hit the ground?

Question

A ball is thrown from a height of 164 feet with an initial downward velocity of 12/fts. The ball's height 
h (in feet) after t seconds is given by the following.
=h−164−12t16t2
How long after the ball is thrown does it hit the ground?

littlebird · Answer

I am having trouble typing on this terrible computer I'm using. Anyway, for real this time, solve the formula for height for 0.

littlebird · Answer

Set h(t) =0. Solve for t.

anonymous · Answer

can you help me with this problem instead?

A model rocket is launched with an initial upward velocity of 195/fts. The rocket's height h (in feet) after t seconds is given by the following. 

h = 195t - 16t2^2

Find all values of t for which the rocket's height is 87 feet.

littlebird · Answer

Its the same as the last problem, bit you're solving h=87 for t. You should get two answers because the rocket will pass 87 Ft on the way up, and on the way down.