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**1. A projectile is fired horizontally from a gun that is 31.0 m above flat ground, emerging from the gun with a speed of 310 m/s. (a) How long does the projectile remain in the air? (b) At what horizontal distance from the firing point does it strike the ground? (c) What is the magnitude of the vertical component of its velocity as it strikes the ground?**

I've gotten the correct answers for:

a) 2.52s

b) 781m

I'm really having a problem with part c. I've tried to get the answer three times and I've gotten it wrong every time. I'm on my last attempt and I really need some help.

I've gotten the correct answers for:

a) 2.52s

b) 781m

I'm really having a problem with part c. I've tried to get the answer three times and I've gotten it wrong every time. I'm on my last attempt and I really need some help.

**2. d=-1/2at**

^{2}, d=vt, v=at, V=sqrtVx^{2}+Vy^{2}, vox =vo cosθ, and voy =vo cosθ**3. Here's my most recent attempt:**

v=at v=(9.8)(2.52)= 24.7 V=sqrt310

v=at v=(9.8)(2.52)= 24.7 V=sqrt310

^{2}+24.7^{2}=311m/s