Projectile Motion traveling particle

[Momentum09]

Hi, can somebody please give me hints as to how to do this problem?

A particle travels between two parallel vertical walls separated by 13m. It moves toward the opposing wall at a constant rate of 5.5 m/s. It hits the opposite wall at the same height.

a) What will be its speed when it hits the opposing wall?
b) At what angle with the wall will the particle strike?

How do I calculate delta y when the initial angle not given?

Thanks so much!

 

[Doc Al]

Hint: Solve for the y-component of initial velocity.
How much time does it take for the particle to travel between the walls?

 

[Doc Al]

Yes, you'll need the inverse tangent. Be sure to draw yourself a diagram so that you identify the correct angle. (Note that it asks for the angle with the wall.)