How Do You Calculate Final Y-Velocity of a Projectile?

[yankeekd25]

Homework Statement

A projectile is launched at 40 m/s and an angle of 38 degrees. After some time, its angle of trajectory is 24 degrees below the horizontal. What is the final velocity in the y direction at this time? Answer in m/s.

Homework Equations

 

[string_656]

Find the x-axis motion... so... cos 38 * 40 = 31.52 m/s.. now that never changes in ideal conditions...only in the y direction the velocity changes due to gravity.. now u no at some time its 24 degrees below horizontal.. the ball or what ever is still traveling at 31.52 metres/s in the x direction.. and you have and angle.. so using triangle formulas... tan 24 * 31.52m/s = 14.0333m/s towards the ground.. i think this is right.