A Projectile Is Thrown from the Top of a Building

Multiple Choice

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