a ball is thrown from an initial height of 3 meters with an initial upward velocity of 15 m/s. The ball's height h ( in meters) after t seconds is given by the following h=3 + 15t - 5t2 find all values of t for which the ball's height is 8 meters

Question

a ball is thrown from an initial height of 3 meters with an initial upward velocity of 15 m/s.  The ball's height h ( in meters) after t seconds is given by the following  h=3 + 15t - 5t2  find all values of t for which the ball's height is 8 meters

random231 · Answer

Heyy there! welcome to openstudy.

random231 · Answer

first you need to find out the actual height that you need to calculate from the given equation.

anonymous · Answer

8 meters

random231 · Answer

nope thats the total height. the actual height would be 8-3=5 meters

random231 · Answer

then put it on the other side of the equation and solve it fot 't'

irishboy123 · Answer

@paygeaspenG 

just go ahead and solve for $h(t) = 8$

irishboy123 · Answer

so you are solving
$$3 + 15t - 5t^2 = 8$$