You are standing on top of a building that is 75-m high and you throw a 3-kg stone horizontally at a speed of 5.4-m/s. How far from the base of the building will the stone land? (the ground is flat)

how long does it take to fall 75m?

h=gt
75=9.8t solve for t.

Now how far horizonally does it go in this time
distance=5.4m/s * t