A projectile is thrown from the top of a building with an initial velocity of 30 m/s in the horizontal direction. If the top of the building is 30 m above the ground, how fast will the projectile be moving just before it strikes the ground?
A. 35 m/s
B. 39 m/s
C. 31 m/s
D. 43 m/s
E. 54 m/s
Answer: B
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