Ek = 1/2 x m x v ²
1/2 x 620.0 x 9.00 ² = 25,100
71 MPM (Meters Per Minute)
S = Speed
D = Distance
T = Time
to find the Speed you divide D by your T
I believe the answer is A, temperature and number of particles are constant. Correct me if i'm wrong :)
Among the options, the two astronomers who supported the Earth-centered system were Tycho Brahe and Ptolemy.
Both astronomers developed in fact a system where the Sun was located at the center, while the Earth and the other planets were orbiting around the Sun.
