1. The problem statement, all variables and given/known data Jumping straight up, how long will a kangaroo remain in the air if it jumps through a height of 3.0m? 2. Relevant equations d=vf(t) - 1/2 a (t)2 I Think? 3. The attempt at a solution Defined all variable d=3.0 m a=9.81 m/ss vf=0m/s2 then: d=vf(t) - 1/2 a (t)2 3.0=0 - 4.905(t)2 0.61=(t)2 t=Square root of 0.611 t=0.78 I got the wrong answer. But when I multiplied my answer by two I got the right answer. Don't know why so I'll need some help here. And I know I skipped some calulation steps in my answer, I have them written on paper.