Find the magnitude of the initial velocity.

[jessicax07]

Homework Statement

A ball thrown into the air lands on the same horizontal level, 38 m away, and 3 s later. Find the magnitude of the initial velocity.

Homework Equations

x = v_ox

The Attempt at a Solution

I just plugged the x distance which is 38m and the time which is 3s into the equation on top and got the wrong answer..

 

[Mindscrape]

That's because you only found the velocity in the x direction. Though I suppose that unless the problem specifically stated that there is a non-zero y velocity then you'd be right. You also have to find velocity in the y direction to get the total velocity. Then find the total magnitude.