# Help on 2 Force questions

1. Nov 8, 2006

### danield

Hey.. i am having problems solving the following question...

2) A 40-kg kangaroo exerts a constant force on the ground in the firs 60 cm of her jump, and rises 2.0 m higher. When she carries a baby kangaroo in her pouch, she cna rise only 1.8 m higher, What is the mass of the baby kangaroo?

I am not interested in the answer so much.. but in the logic of the problems.. i just cant do a free body diagram for them..
plz help
,dan

Last edited: Nov 8, 2006
2. Nov 8, 2006

Well, for (1), which forces are acting on the crate? Further on, what does the constant velocity tell you about the forces acting on the body?

3. Nov 8, 2006

### danield

ok 1.. i could solve.. i used the equation of force applied+weight=force of friction, and i found force applied and the direction.
But im still having trouble wiht 2)

4. Nov 8, 2006

### danield

Well ive been trying to do something like 2y/g=t^2, then V=y/t and then A=v/t, but i guess that is not working, i think ive been seeing it from the wrong angle, but any way i try i cant get the answer :(