When a ball is thrown, its height in meters "h" after "t" seconds is given by the equation

h= vt - 5t^2

where "v" is the initial upwards velocity in meters per second. If v = 7 meters per second, find all values of "t" for which h = 1 meter. Do not round any intermediate steps. Round your answer 2 to decimal places.

(If there is more than one answer, enter additional answers with the button that says "or".)

Question

When a ball is thrown, its height in meters "h" after "t" seconds is given by the equation

h= vt - 5t^2
 
where "v" is the initial upwards velocity in meters per second. If  v = 7 meters per second, find all values of "t" for which h = 1 meter. Do not round any intermediate steps. Round your answer 2 to  decimal places.

(If there is more than one answer, enter additional answers with the button that says "or".)

anonymous · Answer

h=7t-5t²
1=7t-5t²
5t²-7t+1=0
Using quadratic formula:
t=(7+sqrt(29))/10 = 1.23851648 s
or
t=(7-sqrt(29))/10 = 0.161483519 s

anonymous · Answer

thanxz bro ur a math wiz lol ;-)