Projectile motion and kinematics in 2D

[Ajeezy]

Homework Statement

A dolphins leaps out of the water at an angle of 35 degrees above the horizontal. The horizontal component of the dolphin's vleocity is 7.7 m/s. Find the magnitude of the veritcle component.

Homework Equations

I'm not sure what equations to use.

The Attempt at a Solution

No attempts either, I'm totally clueless.

thanks for any help

 

[radou]

How are the components of the velocity vector related to its magnitude?

 

[Cudi1]

you know the horizontal component, and you know that horizontal component*costhetheta yields an answer of 7.7 m/s , so find vi, and solve for vertical component