Both were necessary skills during that time. They needed to know how to sail to get to distant trading spots, and when they got there, they needed to know the best way to trade for the most income.
I think you might mean friction here: the force that applies when two objects are touching and then moving ("sliding") against each other.
Other than that any two objects with mass are subjected to the force of gravity.
Answer:
from all distances within 1000 feet.
Explanation:
California law has made it mandatory for every vehicle to have 2 functional tail lamps that are visible from all distances within 1000 feet.
This step is taken by California lawmakers to ensure road safety for the people on the road.
Most of the accident took place in the dark, vehicles are not properly visible so, to avoid the chances of the accident this law was made mandatory.
