If the spores are shot out horizontally at the maximum speed, how far away from the fungi do they land

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?