Calculating the Speed of a Dropped Rock on Mars

[kmiller]

Homework Statement

An astronaut on Mars drops a rock straight downward from a height of 0.90 m. If the acceleration of gravity on Mars is 3.73 m/s2, what is the speed of the rock when it lands?
find m/s

The Attempt at a Solution

.90m/3.73m/s2=.2413
squareroot .2413=.491

.90m+1/2(3.73m/s2)(.491)
=1.816m/s
it was wrong what equation am i suppose to use?

 

[Mattowander]

There is an easier equation that you can use : Vf^2 = Vo^2 + 2ad.

Also, just a suggestion, it's a lot easier to help you when you put units on your answers.

 

[kmiller]

ill remember that

 

[kmiller]

I got the right answer I think I am just having a hard time with what equations I have to use.