# How to find Final Speed.

A steel ball is launched at 25 degrees above horizontal from the top of a platform that is 15 meters above ground. If the initial speed is 10m/sec, what is the final speed when it strikes the ground?

tiny-tim
Homework Helper
hi rqu1ntana! welcome to pf!

show us what you've tried and where you're stuck, and then we'll know how to help!

(use the standard constant acceleration equations, in the x and y directions separately)

The problem is that its for a test and i just want to be sure what i did was right. This is what i did,

I used the formula Vf2=Vi2-2g(y-yi), where Vi2 is the initial velocity, g is gravity=9.8, y is 0, and yi is the height.

from all the data given this is what it looks like, Vf=(102-(2*9.8*(-15)))1/2

The result i get from this is 13.56m/sec, i this right?

tiny-tim