A ball is thrown from an initial height of 2 feet with an initial upward velocity of 21f/s. The ball's height (in feet) after seconds is given by the following.

h= 2 + 21t - 16t^2

Find all values of T for which the ball's height is 8 feet.

Round your answer(s) to the nearest hundredth.

Question

A ball is thrown from an initial height of 2 feet with an initial upward velocity of 21f/s. The ball's height (in feet) after seconds is given by the following. 


h= 2 + 21t - 16t^2 

Find all values of T for which the ball's height is 8 feet. 

Round your answer(s) to the nearest hundredth.

irishboy123 · Answer

h(T) = 2 + 21T - 16T^2  = 8
solve
  16T^2 - 21T  + 6    = 0
for T