(adsbygoogle = window.adsbygoogle || []).push({}); 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=v_{f}(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/s^{s}

v_{f}=0m/s^{2}

then:

d=v_{f}(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.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: How Long Something Stays in Air Calculation. Help Needed !

**Physics Forums | Science Articles, Homework Help, Discussion**