A model rocket is launched with an initial upward velocity of

39/ms

. The rocket's height

h

(in meters) after

t

seconds is given by the following.

=h−39t5t2

Find all values of

t

for which the rocket's height is

22

meters.

Round your answer(s) to the nearest hundredth.

(If there is more than one answer, use the "or" button.)