Homework Help: Need Help with Projectile Motion Problem

lol I'm seeing a lot of projectile problems posted today.

You've done the major part of calculation. The y-direction of velocity occurs when the projectile lands, meaning at that particular point there is no x-direction of velocity. And initially, when the ball is thrown you only have x direction of velocity. Does this give you a clue of how to solve the last part? You only have to do one simple arithmetic.

 

OOPS OOPS, damn, forget my last response, that was misleading (Damn, I had too many beers last night). You DO have both x and y components of velocities when the ball lands. You've calculated the y-component of velocity and x-component of velocity stays the same, so your total velocity is

[tex]v = \sqrt{v^2_x + v^2_y}[/tex]

Then the problem says this is 4 times greater than the initial velocity, which only has x-component on it. Set the total velocity equal to [tex]\frac{v_x}{4}[/tex], solve for [tex]v_x[/tex]