It should be easy for us to get used to the idea that force isn't necessary to maintain motion at constant velocity; nevertheless, that idea is still not entirely natural. Galileo first came to this ...

Galileo Galilei was the founder of modern physics ... the relationships between distance and velocity and between distance and time and at the continuity of acceleration. He struggled towards ...

the receiver achieved position accuracy within 1.5 km and velocity accuracy within 2 m/s. It successfully acquired signals from four GPS satellites (L1 and L5 frequencies) and one Galileo satellite ...