How do i solve this physics problem?

Like this:

1).  Ignore the 22.7 m/s horizontal speed.  It doesn't make a bit of difference, and the answer doesn't depend on it.  (A bullet fired horizontally from a rifle and another bullet dropped from the end of the rifle barrel at the same time both hit the ground at the same time.)  

2).  Calculate how long it takes an object dropped from rest to fall 42.3 m.  Use the "dropped from rest" formula:

Distance = (1/2) (acceleration) (time)²

3).  In the formula, "acceleration" is the acceleration of gravity.  If this story happened on Earth, then use the acceleration of gravity on Earth.  That's 9.81 m/s² .  

I wish I could make it more complicated for you, but I don't know how.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.