A is a continuous flow of water in a single direction. *

A River system

Explanation: A is a network of streams that drain an area of land and contains all of the land drained by a river including the main river and all its smaller streams or rivers that flow into larger ones, or tributaries (Source Quizlet)

f=ma newton

f=100x2.5=250n

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19