At the Same Moment, One Rock Is Dropped and One $29 \mathrm {~m} / \mathrm { s }$

Short Answer

At the same moment, one rock is dropped and one is thrown downward with an initial velocity of $29 \mathrm {~m} / \mathrm { s }$ from the top of a building that is $300 \mathrm {~m}$ tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.